Moto X4 on Google FI - Enable RCS Messages

On my Moto X4 (Google FI), I couldn't enable RCS messages in the Messages application as it was stuck "verifying" my phone number. After a bunch of support forums, this is the procedure that ultimately worked for me.

1. Turn on Airplane mode.
2. Open the Settings -> Apps & notifications.
1. If you don't see all your apps, first tap See all apps or App info.
2. At the top right, tap More More and then Show system.
3. Find the Carrier Services app.
1. Tap Force stop and confirm.
2. Tap Storage and then Clear data.
4. Go back to the "App info" screen and find the Messages app.
1. Tap Force stop and confirm
2.  Tap Storage and then Clear data.
5. Turn off Airplane mode.
6. Open Messages and checked the settings, it should said "Connected - Chat features are ready for use".

I'm blogging this so I don't forget the process if this ever comes up in the future.