Hi everyone,
I'm currently developing a Custom Data Connector with the PKCE OAuth2 flow.
We are having some strange issues during a data refresh when an expired access_token is provided.
From Fiddler, we can see that the initial exchange for a new token occurs successfully. But shortly thereafter, multiple calls are made to the /token endpoint using the old refresh_token. It appears that the number of subsequent calls correlates to the number of queries/tables used.
Other observations:
- Similarly, navigating to the Connector/Navigator window will correctly refresh the token too if the access_token
- From the screenshot, you can see a successful call to the endpoint for that single thread.
- From Power BI Desktop, the user will be presented the SignIn/Credentials window with the error "The credentials provided are invalid" for every query in the refresh (if they selected cancel).
- The subsequent data refresh will now work as the new tokens have been stored correctly from that first successful exchange.
- However this is not the case for when the on-premises gateway is used.
I'm wondering if this is a known bug?
Our auth implementation is quite close to the sample: https://github.com/microsoft/DataConnectors/tree/master/samples/OAuthPKCE
Other reference with exact same issue, which seems unresolved.
https://community.fabric.microsoft.com/t5/Developer/Custom-Connector-failing-on-refreshing-data-with...
