@dnutbourne , @dnutbourne
My problem for access token is resolved, I think it was gmails cache problem, since I had logged into multiple accounts from same browser, That might have caused ambiguity. when I signed out of all the accounts and then logged in with one account, it authenticated successfully. Thank you for your responses.
@ppappas
if you have the same error, and also logged into many accounts through same browser, you should also do the same, but all of first in updraft dashborad goto advance setting then, select wipe setting, it will clear all your previuos settings. The try to re authenticate the google account
