Error "Face ID is not available" on iPhone
My Face ID invisible Please connect your Face ID
[Re-Titled by Moderator]
iPhone XS Max
Samimahmedsy ~ Your Face ID problem is probably due to the battery being "Unknown ⚠︎". As Apple says: "Using nongenuine batteries might also result in unexpected behavior...":
About genuine iPhone batteries
...So have that nongenuine battery replaced with a genuine iPhone battery. Then Face ID will probably become available as expected:
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