"Change your phone number?" notification

Since I got my new Google Pixel, I've received a "Change your phone number?" notification upon each boot up. Nothing I've done has remedied the issue...

Here's what I've tried so far:

1. Selected the notification, provided my credentials, updated my phone number (which has been the same for years), and applied the changes.


2. Rebooted lots of times.


3. Wiped the cache for Google Play and Google Play Services.


4. Removed my account's recovery phone number, then re-added my phone number.


5. Removed my Google account from the phone, then added it again.

Short of factory resetting the device, I'm not sure what else to try. This issue has been going on for 8 days now. It's rather frustrating.

Here's a screenshot of the issue: