Code and Authorization token became invalid after linking

We are implementing linking between account in Auth0 DB and google. We try to login using google account then perform registration and linking. But after this the Authorization token generated by /oauth/token became invalid. We cannot even refresh it. Even the Code retrieved to be used to get authorization token became invalid. We want to access our APP immediately after registration and linking without prompting the user to login again after linking. Can we do this or the user really needs to login again?

Can we get Authorization token without user action?