Please do a search on this i can tell you this is posted.
Im going go give you 2 things you should read regarding real debrid. Also bot everything will be available in 4k links btw, especially stuff not out to stream or stuff in theaters.
Please see this mega cinemahd troubleshooting guide.
Make sure your real debrid is up-to-date.
Re authorize your account on the app/apk you are using
Delete your devices in real-debrids website and re add them
Make sure they are added in real debrid.
These steps are a must and will solve the issue 9 out of 10 times. Also check real debrids Twitter for status updates.
Take a look here for the best recommend aps with real debrid setup.