Hello sumonahmed3000,
Welcome to Apple Support Communities!
We understand that you’re unable to use Face ID on your device and are seeing a message indicating that “A problem was detected with the TrueDepth camera. Face ID has been disabled.” We’d like to help.
We see that you’re coming to us from If an alert says Face ID has been disabled on your iPhone or iPad Pro. Have you tried the suggestions in that resource under the “What to do next” section?
It might be helpful to try the steps in this resource as well: If Face ID isn't working on your iPhone or iPad Pro.
As a next step, “If you can’t enroll your face, take your device to an Apple Retail Store or Apple Authorized Service Provider or contact Apple Support.”
Have a nice day.