1. Check that the email account was set up correctly on both devices.

Be sure to include the correct server information, username, password, etc. when setting up the account.

2. Ensure that you are connected to a secure Wi-Fi network.

If the Wi-Fi connection isn’t secure, emails may not be syncing correctly.

3. If you're using a third-party email app, try switching to the native mail app.

Sometimes the third-party mail app may not be syncing correctly due to an incompatibility issue.

4. Check the sync settings on both devices.

Be sure to select the most appropriate frequency for syncing emails.