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Power Automate - Building Flows
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Error connecting to Bookings

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Hi
 
I get the following error, wehn I try to connect PowerAutomate with Bookings
 
Fehler bei der Anforderung für dynamische Aufrufe: "Failed to get onbehalfof access token: connectionId=microsoftbookings, message={\"error\":\"invalid_grant\",\"error_description\":\"AADSTS50013: Assertion failed signature validation. [Reason - Key was found, but use of the key to verify the signature failed., Thumbprint of key used by client: 'C8453099758BD74EC273EED06765926DE39BDEC4', Found key 'Start=10/01/2025 05:16:36, End=10/01/2030 05:16:36', Please visit the Azure Portal, Graph Explorer or directly use MS Graph to see configured keys for app Id '00000000-0000-0000-0000-000000000000'. Review the documentation at https://docs.microsoft.com/en-us/graph/deployments to determine the corresponding service endpoint and https://docs.microsoft.com/en-us/graph/api/application-get?view=graph-rest-1.0&tabs=http to build a query request URL, such as 'https://graph.microsoft.com/beta/applications/00000000-0000-0000-0000-000000000000']. Trace ID: cc4d5c4a-fdcb-4986-a39b-1fbfe0a24a00 Correlation ID: 01e3101d-cb03-4832-908b-ed0a78de1b94 Timestamp: 2025-10-30 16:59:01Z\",\"error_codes\":[50013],\"timestamp\":\"2025-10-30 16:59:01Z\",\"trace_id\":\"cc4d5c4a-fdcb-4986-a39b-1fbfe0a24a00\",\"correlation_id\":\"01e3101d-cb03-4832-908b-ed0a78de1b94\",\"error_uri\":\"https://login.windows.net/error?code=50013\"}".
 
I checked the Entry App-Registration, but there is no App registered regarding Bookings. Do I have to set this up manually or is there an automated way?
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