Hello there gichup,
We'd like to help get both your iCloud Mail and Gmail accounts working right with Mail. That's great both devices are already up to date, as we can rule that out as a possible cause. While you may need to reach out to Google for further troubleshooting, we'll only take that step if needed. Let's rule out some other possible causes:
- You mentioned having no issues with the Gmail app, but we recommend also confirming if there are any issues with using the webpage for Gmail.
- We understand you've already tested deleting/adding Gmail to Mail, but we also recommend testing iCloud Mail for any issues.
- If you see an error message, does it provide any insight as to what's happening with Gmail, or any additional steps to take on either device?
We eagerly await your responses to help us get this resolved.