Offsite_Backup GDrive not working as expected

I was trying to setup gdrive backup in v16 but it failed upon authorization and got this error. Used to work fine on V15

Anyone had success connecting Gdrive?

When I click Authorize button it is redirecting to: frappe.integrations.google_oauth.callback

After login to Google account and continue, I am getting above error.

Is the call back url: this?offsite_backups.offsite_backups.doctype.google_drive.google_drive.authorize_access

But, why when clicked authorise takes frappe.integrations.google_oauth.callback??

Help, anyone? :grinning_face_with_smiling_eyes: