Hi @tom123456789101
Welcome to the community.
If we start with iMessage, the wrong number showing can occasionally pop up after moving your number or changing device, but there are steps to get it corrected.
The first one is to check that your number is showing correctly in Settings > Apps > Phone > My Number. If it is different, you can manually change it.
Once the number is correct, turn off iMessage (Settings > Apps > Messages > iMessage) and FaceTime (Settings > Apps > Facetime) and restart the phone, before turning both iMessage and FaceTime back on.
It is also worth checking the numbers listed for sending and receiving iMessage in the same part of the settings to make sure that your number is showing correctly.
If that doesn't help, give our business tech guides a call, and they can look into this further for you.
They'll also be able to help with trying to get the account linked correctly so you can view your online account.
Michael
