Full error message
Error [500] AADSTS65001: The user or administrator has not consented to use the application with ID '78265baa-67a6-4701-af1d-9004e894b4be' named 'Cloud Connector Excel Online'. Send an interactive authorization request for this user and resource.
Resolution
To resolve the issue, please update to the most recent Layer2 Cloud Connector version. Please follow the steps that are described here: Why and How to Update the Layer2 Cloud Connector to check whether you can just do an in-place update and whether you have the right license in place.
After you updated, please set the connection string to
initiateoauth=off;
In case this does not resolve the issue, please notify us by email: support@layer2solutions.com.