iphon/iPad share failed to start because TCP Port 7100 is in use

I am rookie with iPhone products and I have to do some live presentation where I have to to present with my iPad activities on a screen relayed using an App which enables airplay on the client device (PC or MAC)

• Both iPad and client machine are on the same network


• I have launched the app called Zoom on the client machine(Mac)

However, I do not see any option to airplay on my iPad. Also, what I saw here was that I am seeing an error on my Client machine(Mac) which looks like following:

"iPhone/iPad" share failed to stat because TCP port 7100 is in use. Close other application and try again.

Any ideas why?