I have checked with Google support, and they confirmed that I am not hitting any limits. I have workspace account access to support. I also checked the metrics on google and I did not receive the warning email google says I should receive. I am using the API access built in WP Mail SMTP
I know there are many commercial services that would make this easier, but I am trying to stay as light as possible on services. PHP and WordPress versions are both in line with stated compatibility.
Please consider other possible issues.