Ipad can not detect Imac
I would like to mirror the screen of my Ipad pro, 9.7 inch, software version 13.3.1 on my Imac, 27 inch, late 2015. with mac os cataline, version 10.15.3. It worked once, last night, and then I did a software update on the ipad and screen mirroring does not detect the imac anymore.
I also have an Ipad pro , 12.9 inch, software version 13.3.1, and it never worked even once, not even before the software update.
I press 'screen mirroring' and then the little wheel keeps turning and turning but nothing is detected - even the ipads don't detect each other.
All devices are logged into my home network.
Any suggestions? Thanks.
iPad Pro 9.7-inch WiFi, Cellular