when I click on “authorize the access” I see this link
i’m not sure what you configured there but it’s not the right workflow to authorize with Google Calendar.
What you need to do is, to have this workflow:
here is the demo page for this plugin https://bubble.is/page?type=page&name=google-calendar&id=zeroqode-demo-11&tab=tabs-1
you can just copy past most of the configuration there to make it work.