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Power Platform Community / Forums / Power Automate - Connector Development / Failed to refresh acce...
Power Automate - Connector Development
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Failed to refresh access token for service: oauth2. Error: Missing refresh token.

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Posted on 3 Apr 2025 16:17:22 by IL-03041536-0 4
I create a custom connector with authentication type: OAuth 2.0.
If a few hours later I test an action from inside the connector, the test fails.
If I go to connection list, I see a connection with a link to reconnect.
Now if I click on the link, the connection get connected with no other actions and if I repeat the connector test, now all go well.
The error that I can see in the connection details is:
Failed to refresh access token for service: oauth2. ... Error: Missing refresh token.
How can I found the source of the error?
 
The Rest Api, that the connector call, manage only the default connector: 772fxxxxxxxxx/.default
Inside the App Registration, in the Azure Portal, how have I to set the scopes and the API permissions?
Inside the security section of the connector I set the scope: 772fxxxxxxxxx/.default. Any other settings don't work at all.
 
Thank you all.
 
Ignazio
Categories:
Authentication
  • Suggested answer
    IL-03041536-0 Profile Picture
    IL-03041536-0 4 on 05 May 2025 at 12:23:46
    Failed to refresh access token for service: oauth2. Error: Missing refresh token.
    I solved it by adding "offline_access" to the scope in the custom connector.
  • IL-03041536-0 Profile Picture
    IL-03041536-0 4 on 07 Apr 2025 at 09:26:45
    Failed to refresh access token for service: oauth2. Error: Missing refresh token.
    I attached the security tab of the custom connector.
    The api that I use are working when called from other client application. No one tell me of problems after hours of work.
    How can I verify the correct implementation of the refresh token process? I can access the source code.
     
    Ignazio
    SecurityTabOnFirs...
    jRestBody.swagger...
    SecurityTabOnReOp...
  • MichaelFP Profile Picture
    MichaelFP 1,831 Super User 2025 Season 1 on 06 Apr 2025 at 15:34:40
    Failed to refresh access token for service: oauth2. Error: Missing refresh token.
    Can you share the configuration of security tab of the custom connector? and other question your api have implemented refresh token process?

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