If you are using Google's Advanced Protection Program and looking for an email client for Windows 11 that supports it, you might want to try out Microsoft's Mail app. The Mail app is native to Windows 11 and supports various email providers, including Gmail, with a simple and easy-to-use interface.
To set up your Google account with Advanced Protection on Mail app:
1. Open the Mail app and click on the Settings icon in the bottom left corner.
2. Click on "Manage accounts".
3. Click on "Add account".
4. Select "Google" and enter your email credentials.
5. Complete the two-factor authentication process using a physical security key.
6. Once you have successfully authenticated, click "Allow" to grant Mail app permission to access your Gmail account.
With Microsoft's Mail app, you can send and receive emails, use labels, and manage your Google Drive attachments. Additionally, the Mail app can integrate with your calendar to display your upcoming events and reminders.
I hope this helps!