Apple ID greyed out unless on Wi-Fi.

Thanks for posting in the Apple Support Communities Steeler Dave,

You can make changes to and access your Apple ID using the guidance on the following page: Manage your Apple ID

If you need more help, providing some additional information or context about what you're trying to accomplish may increase your chances of getting a specific and relevant response from the community.

Cheers!

Same on my device after upgrading to 17.1.2. I also cannot sign out of Apple ID on my phone even though screen time is disabled, no screen time passcode set, and family sharing disabled. Frustrating.