This is the correct answer. Dell, and other oems, have stored their windows keys in firmware on motherboards for years now. You could literally install on a fresh drive and it should auto activate. Typically at most you have to go to click activate yourself.
This is all assuming the machine came with a pro license and wasn’t upgraded of course. It should have a sticker on it.
This was the issue. I did an update recently of truenas and apparently the polkitd user took over the uid for my plex account. Unfortunately it looks like this also caused some level of corruption since even changing the uid and gid haven’t fixed the issue and plex is borked.
Luckily I have backups, so not all is lost, and even if it was, I could probably just regenerate that data.
Ive had truenas, moved to unraid in the past few months. The one constant has been nextcloud is a pita. Even the legacy manual install blows. I dropped it and have been much happier ever since.