Do you require the client version to use the server version?
I am currently using the client version, but the server version would have been easier.
Yes, I have tried 2 different builds for 1.16.5.
The server logs have no reference to JEI apart from when it says loading resources and lists all the mods, no issues or errors.
EDIT: OH WAIT, do mods have to be installed on both client and server side?