Hi, kitana226,
Welcome to the Apple user-to-user Community.
As we are all Apple users, like yourself, in this Community, Apple will not read your message. (You would need to contact Apple Support.)
We'd like to help, however, yet there's a lot we do not know about the situation.
Re: (the version is up to date)
Apple Support's article (link below) says iPadOS 16.3.1 is the latest version, so am guessing that's what's installed:
About iPadOS 16 Updates - Apple Support
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Re: "why does it keep saying FaceTime and iMessage Activation Error"
Maybe FaceTime isn't getting the strong wi-fi or cellular connection it needs:
Have you checked with your provider ?
What to do:
If you can't activate your iPhone or iPad (Wi-Fi + Cellular) - Apple Support
and
Messages may need both wi-fi for Messages and cellular for SMS & MMS.
Wondering if you have a cellular data plan, and whether it is turned on
(charges may apply from your provider)
How to: Use cellular data on your iPhone or iPad - Apple Support
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Re: "primary Apple ID is not working properly as I have tried logging in for the hundredth time today"
Is your Apple ID working at the online login to your account: appleid.apple.com
Have you signed in (to your iPad) with the correct Apple ID:
Sign in with your Apple ID - Apple Support
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Is FaceTime set-up, ready to use:
If so:
As you have changed your Apple ID ... you may need to log out from the old Apple ID, in order to be able to log back in with the new Apple ID:
If not:
How to: Set up FaceTime on iPad – Apple Support
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If needed: There are "Get Support" links at the bottom of the websites below.
FaceTime Support:
https://support.apple.com/facetime
Apple ID Support:
https://support.apple.com/apple-id
All the best :-)
