On-Prem Gateway - Enterprise mode - oAuth2 authentication with refresh token

Hi,

We are using the on-prem gateway in enterprise mode with a custom connector to refresh an oAuth2 protected odata service. Each time you request a new access token from this service you also get a new refresh token and the previous refresh token is invalidated (this behaviour is optional in the oAuth2 RFC).

In the desktop version of Power BI refreshing data with our custom connector works just fine. The desktop version also seems to respect the expiration date of the access token.

However, using the gateway and the Power BI service, the expiration time of the access token seems not to be respected. The service always requests a new access token using the refresh token. The service also requests a new token for each source (even if they are part of the same connection). This results in multiple requests for new refresh tokens (almost simultaneously) that seem to cross each other, which results in the fact that the second, third, etc call is done with an already invalidated refresh token, which in turn results in an access denied by the oData service.

Why is the desktop version and the service behaviour different? Does anybody have experience with the same issues?

Thank you

Robert