Re: "Facetime Login & Verification issue:
Changed iPads. Trying to get Facetime working. Log in produces a verification message that goes to an Apple.inc page. The wheel of wonder just sits there spinning around with no end in sight."
Seems the iPad you are trying to use may not yet be a device that Apple trusts, ie : listed in your Apple Account (or even logged in to someone else's account ?).
Eg: Wondering whether you have signed in to the iPad you have changed to, with your Apple Account details:
See how to: Sign in with your Apple ID - Apple Support
and
if needed: Get a verification code and sign in with two-factor authentication - Apple Support
Else: If there are no worries with the Apple Account details
For FaceTime:
Check things are set up and ready for calls:
Eg: Get started with FaceTime on iPad - Apple Support
Eg: says:
"Set up FaceTime
Go to the Settings app, tap Apps, then tap FaceTime.
Make sure that you’re signed in to your Apple Account and FaceTime is turned on.
You can choose a default calling option for audio calls below Default Calling App. "
If more than one contact method appears below “You can be reached by FaceTime at,” you can tap to select or deselect it."
__________________
If you still need help:
See what to do: If you can’t turn on or sign in to iMessage or FaceTime on iPad, Mac, or Apple Vision Pro - Apple Support