My phone number is not available for sharing

Hi GGsmith444,

Thanks for posting in Apple Support Communities.

If you believe someone is using your Apple ID, you would want to change your Apple ID password immediately and make sure you have two-factor authentication enabled. You can see where you are signed in.

Use your iPhone, iPad, or Apple Watch to find where you're signed in

1. Tap Settings > [your name], then scroll down. 

2. Tap any device name to view that device's information, such as the device model, serial number, OS version, and whether it's a trusted device that can be used to receive Apple ID verification codes. The information might vary depending on the device type. You might need to answer your security questions to view device details. 

Check your Apple ID device list to find where you're signed in - Apple Support

If you think your Apple ID has been compromised - Apple Support

Regards.