OAuth2.0 token strange behaviour (Invalid Credentials 401)

Question

Usually, Google OAuth2.0 mechanism is working great.

1. The user confirms permission to access Google account with selected scopes.
2. The refresh token is

Answer 1

clearing storage in Google Chrome worked for me (don't know all the details of what 'Clear storage' is clearing):

1. F12 (Ctrl+Shift+I)
2. Application Tab
3. Clear storage