Problems with more than 20 participants in one ROOM

Hi everyone.

I know, its a recurrent question, but I have problems when 20 people connect at the same time.

I installed Jitsi on a 8Cores 64GB server on UpCloud.com, on a fresh Ubuntu distro.

I tried two times connect more than 20 people at the same time, and it was impossible (everybody sees everybody). When the 21 or 22 gets in, after a while, he/she is kicked out. ¿What could be the reason?

The jitsi installation is fresh, from this sunday. I am quite confused. What could be the problem?

Do I need to add

JAVA_SYS_PROPS="-Dorg.jitsi.jicofo.MAX_SSRC_PER_USER=100 …"

in /etc/jitsi/jicofo/config, in the variable JAVA_SYS_PROPS ?

Seen here: https://stackoverflow.com/questions/50361430/how-to-set-max-user-in-jitsi-room

It’s not easy to get always 20 people for the testing…

I edited my xxx.net.cfg.lua file in /etc/prosody/conf.d and it contains now this

Component "conference.myJitsi.ddns.net" "muc"
    storage = "none"
    muc_max_occupants = 3
    modules_enabled = {
        "muc_meeting_id";
        "muc_domain_mapper";
        -- "token_verification";
         "muc_max_occupants";
    }

but I am able to connect with more than 3. I tried to limit to 3 people, so I can test it. (Found here: https://community.jitsi.org/t/setting-that-determens-maxium-number-of-users-in-a-room/28405/2)

Whats the difference between this and setting: “-Dorg.jitsi.jicofo.MAX_SSRC_PER_USER=3 …” ?