Greetings @ArjunCL
Welcome back to the Unreal Forum! If you open up the material instance that you’re trying to use in the view port is there are red text that pops up? If so, what’s it say?
Also, I saw some other users prior saying to go in and uncheck the “Crack Free Displacement” option located on Tessellation tab in the “material result node” in master material of the surface that you want to use. After uncheck, just save it. It seems to have fixed the issue for some users and not for others. But, it might be worth a check as well.