Solution: TL;DR - go to the Application Credentials page (see @allenporter’s link) - delete credentials and the enrollment flow will start fresh.
I’m trying to install the google calendar integration. Apparently on my first attempt I pasted the wrong secret or ID… now whenever I try to add the integration again I get the error: Received invalid token data.
I do not get the first part of the flow where I could entry new credentials.
I dont have anything related to google in any of my yaml files.
I’ve restarted HA and the host system several times