There is an ongoing issue with Amazon authentication that is preventing completion of the OAuth flow when using Amazon as the login provider.
This issue appears to be affecting many apps, including odrive.
We have reached out directly to Amazon and posted on their forum, but we have not heard back from them yet. We will update here as soon as we have more information from them.
For reference:
https://forums.developer.amazon.com/questions/204257/500-error-from-amazon-during-oauth-flow.html