Itgeneor362 Access to the OAuth data source requires a valid access token. The access token could not be acquired

The itgeneor362 error appears to be related to a bug in the Exact Online API when acquiring a new access token with a refresh token and client secret. This bug causes under certain conditions that from that moment on the refresh token chain is broken and the database is no longer usable.

For more details see Itgeneor362 Voor toegang tot de OAuth-gegevensbron is een geldig access token vereist. Het access token kon niet worden verkregen (Dutch).