Hey 11ProFaceID,
Thanks for using Apple Support Communities! I understand you're seeing an error with Face ID. Face ID is a great feature, and I definitely want to make sure that's working as expected for you, and I'm happy to help.
The error you're getting is typically related to the temperature of your device, if you're using your device in extreme cold it may need to warm before all features are working as expected. Is this error only happening when in cold weather, or are you seeing it indoors in warm temperatures as well? You can see more about your device temperature here: Keeping iPhone, iPad, and iPod touch within acceptable operating temperatures
Also, it sounds like you may have already seen the resource below, as it does suggest creating an alternate appearance. Just to make sure no steps are missed, I do want to share it and recommend working through any steps you haven't already done.
If Face ID isn't working on your iPhone or iPad Pro
Thanks again, and have a great day!