I couldn't find a topic specific to authentication, so I posted based on UWP development. We have a customer that changed their Microsoft account password, and suddenly couldn't authenticate for OneDrive through our app. The customer says that
accessing their Microsoft account to remove permissions for our app (as advised) solved the problem.
Hi Rob, only Microsoft knows whether this is an account authentication issue or a OneDrive authentication issue. I can't say for certain that this is a OneDrive issue.