AliRaza110,
Thanks getting back to us and for attempting those steps. We recommend having the latest version of iOS 15.0.1. This helps provide software improvements that can help: Update your iPhone, iPad, or iPod touch
In addition, let's force close the FaceTime app and see if you can create a link for FaceTime. Here's how to force close an app: Close an app on your iPhone or iPod touch
Please keep us posted with the results.
Cheers!