Doorbell cameras a piece of junk. I have 10 RLC-410s that have been working for a long time. Several months ago I ordered 2 only POE Doorbell cameras. I have a Hubitat C7 hub that displays the 410's video perfectly. I use exactly the same setting for the doorbell cameras and they only show one frame and delete all others. I reported months ago and their engineers agreed it was a bug.
This was supposed to be corrected in this latest firmware which has taken forever, but the fix is NOT included. I think it is finally time to send these back for refund and get something better.