Most likely this was my error. I changed the “sender’s email address” in contact forms 7. It turns out your plugin stopped working, and I noticed it immediately. It wasn’t until a couple days later I noticed I wasn’t getting emails when someone submitted a form.
After a bunch of research, I discovered the problem in CF7. Now that I fixed it, NS Goggle Sheets Connector is working again.
My apologies. It was an “ID-ten-T” error all along.
I did regenerate the Google token. No luck.
I may have added Flamingo plugin after installing NS Google Sheets Connector. Sorry, I forget which of the two I added first. I’m pretty sure yours first, then Flamingo.
Other changes: I removed two “fields” from the Contact 7 form linked to my google sheet. Other edits to language were made in the form. I deleted the columns in the google sheet that were associated with the deleted fields in the form. And I added notes to records collected in my sheet – I used columns further to the right. They were ones not in use (empty).
I also installed Yoast SEO plugin after getting your plugin up and running.