How to Send Asana Milestone Updates to Slack with Power Automate

make.powerautomate.com > Create > Automated cloud flow

Create a new Automated Cloud Flow

Go to make.powerautomate.com and sign in with your Microsoft 365 account. Click 'Create' in the left sidebar, then select 'Automated cloud flow' from the options. Name the flow something like 'Asana Milestone → Slack Alert'. You'll be prompted to choose a trigger — search for 'Asana' in the trigger search box. Power Automate will use polling to check Asana on a schedule.

1. 1Click 'Create' in the left sidebar
2. 2Select 'Automated cloud flow'
3. 3Enter a flow name such as 'Asana Milestone to Slack'
4. 4In the trigger search box, type 'Asana'
5. 5Select 'When a task is completed' from the Asana trigger list

Asana trigger card > Sign in > Asana OAuth popup

Connect your Asana account

Click 'Sign in' on the Asana trigger card. A browser popup will open asking you to authorize Power Automate to access Asana. Log in with the Asana account that has access to the projects you want to monitor. After authorizing, the popup closes and you'll return to the flow canvas with the connection active.

1. 1Click 'Sign in' on the Asana trigger card
2. 2Log in with your Asana credentials in the popup
3. 3Click 'Allow' to grant Power Automate read access
4. 4Confirm the popup closes and returns you to the flow canvas

Asana trigger card > Workspace dropdown > Project dropdown

Configure the Asana trigger parameters

With the connection established, the trigger card shows dropdowns for Workspace and Project. Select the Asana Workspace first, then pick the specific Project containing your milestones. If you want to monitor all projects in a workspace, leave Project blank — but be aware every task completion in the workspace will fire the flow. For milestone-only monitoring, it's better to use a dedicated Asana project or tag.

1. 1Click the Workspace dropdown and select your organization workspace
2. 2Click the Project dropdown and select the milestone-tracking project
3. 3Leave the 'Section' field blank unless you want to scope to a specific board column
4. 4Click 'Show advanced options' to confirm no additional filters are hidden

Flow canvas > + New step > Control > Condition

Add a condition to filter milestone tasks only

Not every completed task is a milestone. Click '+ New step', search for 'Condition', and add the 'Condition' control action. Set the left value to the dynamic content field 'Task Name' from the Asana trigger. Set the operator to 'contains', and enter a keyword your team uses to tag milestones — for example, '[MILESTONE]' or 'M:'. Only tasks whose names match this pattern will proceed to send a Slack message.

1. 1Click '+ New step'
2. 2Search for 'Condition' and select it under 'Control'
3. 3Click the left value field and select 'Name' from Asana dynamic content
4. 4Set the operator dropdown to 'contains'
5. 5Type your milestone keyword in the right value field, e.g. '[MILESTONE]'

Yes branch > + Add an action > Data Operation > Parse JSON

Add a Parse JSON step to extract task details

Inside the 'Yes' branch, click '+ Add an action'. Search for 'Parse JSON' and select it from the Data Operations group. In the Content field, insert the full body output from the Asana trigger using dynamic content. Click 'Generate from sample' and paste a sample Asana task JSON payload to auto-generate the schema. This lets you pull clean fields like due date, assignee name, and project name into your Slack message without writing expressions from scratch.

1. 1Click '+ Add an action' inside the 'Yes' branch
2. 2Search for 'Parse JSON' and select 'Data Operation - Parse JSON'
3. 3In the Content field, click the dynamic content picker and select the Asana trigger body output
4. 4Click 'Generate from sample'
5. 5Paste a sample Asana task JSON and click 'Done'

Yes branch > + Add an action > Data Operation > Compose

Add an expression to format the due date

Before building the Slack message, format the due date into something readable. Click '+ Add an action', search for 'Compose', and add a 'Data Operation - Compose' action. In the Inputs field, enter the expression shown in the pro tip section below. This converts '2024-03-15' into 'March 15, 2024'. Reference this Compose output in your Slack message body so stakeholders see a human-readable date, not a raw string.

1. 1Click '+ Add an action' inside the 'Yes' branch after Parse JSON
2. 2Search for 'Compose' and select 'Data Operation - Compose'
3. 3Click the Inputs field and switch to the expression editor (the 'Expression' tab in dynamic content)
4. 4Enter the formatDateTime expression referencing the due_on field from Parse JSON
5. 5Click 'OK' to save the expression

Yes branch > + Add an action > Slack > Post message (V2)

Connect your Slack account

Click '+ Add an action' after the Compose step. Search for 'Slack' and select 'Post message (V2)' — do not use the older 'Post message' action, as it lacks block formatting support. Click 'Sign in' on the Slack action card. A browser popup will open asking you to authorize Power Automate to post to your Slack workspace. Select the correct workspace from the dropdown if you belong to multiple.

1. 1Click '+ Add an action' after the Compose step
2. 2Search for 'Slack' and select 'Post message (V2)'
3. 3Click 'Sign in' on the Slack action card
4. 4Authorize Power Automate in the Slack OAuth popup
5. 5Select your Slack workspace when prompted

Slack action card > Channel field > Message Text field

Configure the Slack message content

In the 'Channel' field, type or select the channel name where milestone updates should go — for example, #project-updates. In the Message Text field, build the update using dynamic content from the Asana trigger and your Compose step. A good format: '✅ *[MILESTONE COMPLETE]* Task: {Task Name} | Project: {Project Name} | Due: {Compose output} | Assigned to: {Assignee Name}'. This gives readers the full context in a single message line.

1. 1Click the Channel dropdown and select your target Slack channel
2. 2Click into the Message Text field
3. 3Type your message prefix, e.g. '✅ *[MILESTONE COMPLETE]*'
4. 4Use dynamic content to insert Task Name, Project Name, formatted due date (Compose output), and Assignee Name
5. 5Click 'Show advanced options' and set 'Bot name' to something like 'Asana Updates' for clarity in Slack

make.powerautomate.com > Create > Scheduled cloud flow

Add a deadline-approaching branch with a Scheduled trigger (optional)

The current flow handles completed tasks. For deadline reminders, you need a separate Scheduled cloud flow. Go back to 'Create > Scheduled cloud flow' and set it to run daily at 8:00 AM. Add an Asana action 'List tasks' filtered to tasks due within the next 24 hours. Loop through results with an 'Apply to each' action and post a Slack reminder message for each approaching deadline using the same Slack 'Post message (V2)' action.

1. 1Click 'Create' and choose 'Scheduled cloud flow'
2. 2Set recurrence to every 1 day at 8:00 AM in your local timezone
3. 3Add 'Asana - List tasks' action and filter by due date using today's date plus 1 day
4. 4Add 'Apply to each' control over the task list output
5. 5Inside the loop, add 'Slack - Post message (V2)' with a reminder-formatted message

Flow canvas > Test (top right) > Manually > Trigger now

Test the flow with a live Asana task

Save both flows. In the automated flow, click 'Test' in the top right corner and select 'Manually' to watch a live run. Go to Asana, find a task in your configured project with '[MILESTONE]' in the name, and mark it complete. Switch back to Power Automate — the test panel should show the trigger firing within 1-5 minutes. Check your Slack channel for the formatted message.

1. 1Click 'Save' in the top right of the flow canvas
2. 2Click 'Test' and select 'Manually'
3. 3Open Asana in another tab and mark a milestone task complete
4. 4Return to Power Automate and watch the test panel for trigger activity
5. 5Check the target Slack channel for the message

My flows > [Flow Name] > 28-day run history

Turn on both flows and verify run history

With testing confirmed, make sure both flows are toggled to 'On' — check the toggle at the top of each flow's detail page. Wait 24 hours and then open 'My flows', click each flow, and review the '28-day run history' panel. Confirm runs are completing without errors. Set up email notifications for flow failures by going to the flow's detail page and enabling 'Send me an email when this flow fails'.

1. 1Navigate to 'My flows' in the left sidebar
2. 2Click each flow and confirm the toggle at the top shows 'On'
3. 3Check '28-day run history' for green success icons
4. 4Click the ellipsis (…) menu on the flow card and select 'Edit' > check error notification settings
5. 5Enable 'Send me an email when this flow fails' for both flows

Paste these expressions into the Compose action (Step 6) and the Slack message field (Step 8) in Power Automate. The first block formats the Asana due date safely. The second block builds a conditional Slack message that handles unassigned tasks and missing due dates without breaking the flow.

// Expression 1: Safe due date formatting (paste into Compose action Inputs field)
// Handles the date-only string Asana returns and formats it for humans
formatDateTime(

// Expression 1: Safe due date formatting (paste into Compose action Inputs field)
// Handles the date-only string Asana returns and formats it for humans
formatDateTime(
  concat(
    coalesce(body('Parse_JSON')?['due_on'], '1970-01-01'),
    'T00:00:00Z'
  ),
  'MMMM dd, yyyy'
)

// Expression 2: Full Slack message body (paste into Slack Post message V2 > Message Text)
// Handles null assignee and null due date gracefully
concat(
  '✅ *[MILESTONE COMPLETE]* ',
  'Task: ', body('Parse_JSON')?['name'],
  ' | Project: ', coalesce(body('Parse_JSON')?['projects']?[0]?['name'], 'Unknown Project'),
  ' | Due: ', outputs('Compose'),
  ' | Assigned to: ', coalesce(body('Parse_JSON')?['assignee']?['name'], 'Unassigned'),
  ' | <', body('Parse_JSON')?['permalink_url'], '|View in Asana>'
)