ORBI RBR50 not honoring reserved IP addresses

A solution to this issue eludes me.  Given that the Orbi has an IP address assigned to this MAC address in the LAN Setup table (Advanced Tab, Setup), it should get the same IP address every time.  Provided, of course, that there was not a different computer already using that IP address when the DHCP request came in..

Maybe it is time to capture the DHCP packets that are passing between the Pi and the Orbi.  One way to do this is to go into the Orbi "debug" screen, Enable LAN/WAN Packet Capture, then click on Start Capture:

Then power up the Pi, check which MAC and IP it gets.

Do a restart & check again.

Do this a couple of more times.

Then go back to the debug page and "Save Debug Log".  This will put a zip file on whatever computer you are managing the Orbi from.

The zip file has LOTS of stuff in it.  Unzip it and then use Wireshark (or something like it) to open the LAN file.

Filter the output on "DHCP" and it should show all the interactions between the Pi and the Orbi.