I have two rpi's each running Media Centre 25 version 114. Both running with a MC26 Master License. Both are hard wired to the same router. They were working fine until I upgraded one from Stretch to Buster. When I upgraded one rpi to buster, as a fresh install, I re-installed MC25. While I am sorting out the buster issues I noticed that now both rpi's JRiver have the same media access key. Previously they had different access keys.
The rpi that I upgraded now has the same media access key as the rpi that is still based on stretch. This doesn't make sense as JRemote needs a distinct access key to identify the correct rpi, and I thought that the access keys were a random 6 digit code. I was having some library issues, so I restored the library from my stretch rpi to my buster rpi, I wouldn't have thought this might be the source of my problem, but that is the only thing I can see that I have done differently from any other time that I have re-installed MC.
How can I get the buster rpi's MC to get a new access key? I tried the reset and that didn't do anything, and I don't see any option to generate a new code.