Token has been expired or revoked.(invalid_grant)

Hi

I had OAuth2.0 set up fine with gsuite gmail smtp.

But suddenly we started getting: ‘Token has been expired or revoked.(invalid_grant)’ errors and emails stopped sending…

This makes the API connection method pointless if tokens expire. Might as well just use normal smtp authentication?

Also it would be a very handy feature if an error did occur somehow the plugin could fall back to sending locally again (default wp_mail etc) so we don’t loose out on emails not being sent etc… a simple try catch method or something?

I set up gmail smtp to gaurentee deliverability yet we failed to send 20 or so order confirmation emails before we noticed ??

Again another enhancement would be to email admin when there is a serious error and emails fail to send.

Any ideas if tokens shouldn’t expire or something odd happened?

Cheers