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New Member

Approval has been performed and registered in Microsoft Flow portal, but the Approval action times out anyhow



Even though the approver has performed the approval almost immediately, the Approval action times out!!


ActionTimedOut. The workflow action 'Start_and_wait_for_an_approval_PO' timed out while waiting for webhook callback.

The Timeout setting is configured to "PT5M"

Webhook callback.png


And I can see that the approval has been registered when I log on to !



As you can see I have gathered the relevant actions in a Scope. The exact copy of this scope is working in another flow (Timeout config set to only 2 mins PT120S) without any issues!


Hope you can help on this urgent issue



New Member

Also wanted to add that when I Peek Code, the working and the faulty Approval requests look identical!


    "inputs": {

        "host": {

            "connection": {

                "name": "@parameters('$connections')['shared_approvals']['connectionId']"



        "body": {

            "notificationUrl": "@{listCallbackUrl()}",

            "title": "ID01 PO approval request for @{triggerBody()?['Title']} (@{triggerBody()?['StudyTitle']})",

            "assignedTo": "@variables('vPOApprover')",

            "details": "Requestor: @{triggerBody()?['Author']?['Email']}\nWhen: @{triggerBody()?['Created']}",

            "itemLink": "@triggerBody()?['{Link}']",

            "itemLinkDescription": "@triggerBody()?['StudyTitle']",

            "requestor": "@triggerBody()?['Author']?['Email']",

            "enableNotifications": true,

            "enableReassignment": false,

            "attachments": "@variables('vAttachments')"


        "path": "/types/@{encodeURIComponent('Basic')}/subscriptions",

        "authentication": "@parameters('$authentication')"


    "limit": {

        "timeout": "PT120S"


    "metadata": {

        "flowSystemMetadata": {

            "swaggerOperationId": "StartAndWaitForAnApproval"




Community Support
Community Support

Hi @Monza ,


Could you please share a screenshot of the configuration of the "Start and wait for an approval" action in your flow?


Best regards,



Community Support Team _ Alice Zhang
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