I have the same thing; I think this a bug in YunoHost’s diagnosis. It tests both UDP and TCP, and reports an error if at least one is closed… event if the service wants only UDP.
I feel it will be a spammy subject. I propose to have a debug session during the weekend on IRC/Matrix and report here if we find a solution. Is that OK for you?
I am no wizard, but let’s try (and it may be a similar issue as Mamie’s). Are you sure you are getting an handshake after connecting on your laptop? (check with sudo wg
)