Hi, it’s the same for me. I have 2 sites with the plugin, one of them with the updated plugin (pro 4.6.3) and it is the one that gives me error. The API developer key is invalid.
The keys are correct and the APIs are enabled.
My other site with the plugin in verisón free 2.9.3 connects well with google drive, it works. But with visual errors for being outdated.
I hope you can solve it
Greetings.
