If you mean XEP-0172 then there is no server support required. I don't know why it is on a list of XEPs that a server supports other than the possibility of using server side storage in the form of XEP-0163 (PEP).
Re:Jackal 0.54.1 – Go XMPP Server
by runawaybottle on Friday June 18, 2021 @04:01PM
(#27554332)
You must not have seen sprint planning now days.
Incidentally, that one is missing from jackal's list. I wonder if that means that you can't set or see users' nicknames when using it?