Hello Natisha241,
We understand that you are having an issue with making video calls in social media apps and FaceTime. We'd love to help. First, can you tell us what is happening when you try to make the video call? Are you getting an error message? If so, what is the specific error?
Also, since you are having an issue with using FaceTime, let's complete the steps listed here: If you can't make a FaceTime call on your iPhone, iPad, or iPod touch to see if it resolves the issue.
Also, is your iPhone using the latest software version 13.6.1? You can check your version number in Settings > General > About, next to version? If it is not, then please backup the device and update the software using the steps here: Update your iPhone, iPad, or iPod touch. Keeping the device software up to date will possibly resolve any software related issues with the apps.
Have a great day!