This is exactly what I had happen as well.
I'm going to give it some time. I also even went through these steps (https://support.plex.tv/articles/204281528-why-am-i-locked-o...) without success.
I'm going to give it some time. I also even went through these steps (https://support.plex.tv/articles/204281528-why-am-i-locked-o...) without success.
After removing the attribute entirely it was able to successfully reclaim the server.