Tengo el mismo problema. No consigo pasar esa validación, por lo que no me guarda las copias en Google Drive, tan sólo en mi carpeta de wp. Tengo que decir que trabajo en localhost.
I have the same problem. I can not pass this validation, so I do not keep copies in Google Drive, only in my wp folder. I have to say that working in localhost.
I have followed those steps many times and I still receive the same error message. 🙁
You getting this error while creating API access or while entering google account details into site? did you check your redirect url while creating API access?
While entering the Google account details into site. Yes I have double checked the redirect URL.
Is it possible to get your website admin login? if so please send the details to malarvizhiatsecurenextdotnet.