I’m having the same issue with Simple Calendar plugin. I’ve had this installed for a couple of days and occasionally it gives me the “While trying to retrieve events, Google returned an error:
Please ensure that both your Google Calendar ID and API Key are valid and that the Google Calendar you want to display is public.”
It’ll be working for while and then at some point it will just stop. I’ve double checked my share status, API, & ID in google and all are correct.
This is not a legit workaround but something I found strange is if I change the view settings it’ll start working again. I’ve had it in “list” mode and if I switch it to Grid it starts working. To me indicates its something with the plugin and not Google.
