Hi Jenidoran,
Thanks for reaching out using Apple Support Communities. Here to help.
We see you came from the related article, 'If you can't make a FaceTime call on your iPhone, iPad, or iPod touch'. Can you explain what happens when you try to make a FaceTime call?
The symptoms you're describing sound related to the Face ID unlock method. Is this what you're having trouble with? If so, take a look over the next article for steps to try.
If Face ID isn't working on your iPhone or iPad Pro
Additionally you may want to follow the steps in this article to check for a Face ID disabled alert in Settings.
If an alert says Face ID has been disabled on your iPhone or iPad Pro
Hope this helps! Let us know if we can clarify anything further.