401. That’s an error. Error: invalid_client no application name

That error is displayed in case that under “APIs & auth” -> “Consent screen” you have empty field “PRODUCT NAME” – you need to select e-mail address as well.

Source: https://stackoverflow.com/questions/18677244/error-invalid-client-no-application-name

Thanks Maxime, that solved my issue.
Frenchie ?

Yes ??