@reolink-fiona I just realized I was using a client version from 2018 Once I DL the new client version I could get the new cameras connected using UID easily! Thanks Fiona and @crimp-on_62210811129.

To get the new 510A's to show up in Blue Iris though I had to go into setting-->network-->advanced-->port settings(setup)-->
activate RTSP Port AND make sure ONVIF was on too and port matched Blue Iris.

RTSP was off by default in my case for the NEW 510A'a!

@crimp-on_62210811129
Yes, all 20+ working Reo's are on the same subnet. The client app does show 6-8 unused "slots" for more cameras which makes me think I still have more room for adds (I could be very wrong assuming this too) .

I have 22 Reo cameras of which 8 are 510A's. My existing 22 Reo's all show on my Windows 10 Reo desktop app. I purchased 2 new 510A through Amazon and neither are found by the desktop app. I have reset to factory both cameras. I was able to find one of the cameras using the Android app. Using the android app I was able to get an IP for the camera and manually connect through Chrome. I use Blue Iris as my NVR and since I can't change the H.264 Profile to "baseline" BI doesn't find the camera. My POE sw is 802.3af.

Can I change to baseline in the android app and how?
Why do the new cameras NOT show up in Windows Reo App? Too many cameras?
Any suggestions?