I get this message when trying to sign up for Cesium Ion using my google account:
Access blocked: This app’s request is invalid
You can’t sign in because this app sent an invalid request. You can try again later, or contact the developer about this issue. Learn more about this error
If you are a developer of this app, see error details.Error 400: redirect_uri_mismatch
Following links from this page: WebODM – Cesium