Hi. Yes, I get that too. My problem was I couldn't login to the UNRAID connect without the error whereas now I can. I initially thought the update error was one and the same but clearly not. I'll post another update if I make more progress.
I had the same issue but managed to resolve by deleting the certificate from the UNRAID Settings/ManagementAccess page and then doing another "provision". After this I was able to reconnect to UNRAID Connect via the plugin.