forceload command not found in multyplayer

Are you an operator on the server? What is op-permission-level set to?

whoeps my bad,

I did not known about the ops lvl in the ops.json

(that was the only file I reused for my tests)

I changed the lvl in the server.properties only

damn, my comment is reopening this ticket, sorry for the extra workload

Did you set it to something under 2?

"level": 3

In ops.json was the setting on 3, so I changed this to 4 and the command was available