It’s not letting me sign in

make sure you have followed everything as outlined in the resource below;

If you can’t turn on or sign in to iMessage or FaceTime

https://support.apple.com/en-us/HT201422

ileana277 Said:

"It’s not letting me sign in: Not letting me sign into FaceTime or messages"

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A Few Sites to Try:

• If Face ID isn't Working on your iPhone or iPad Pro - Apple Support

• If you can't Make a FaceTime Call on your iPhone, iPad, or iPod touch - Apple Support

• If an Alert Says Face ID has been Disabled on your iPhone or iPad Pro - Apple Support

• If you Experience an Error when Trying to Activate iMessage or FaceTime - Apple Support