SimpleVoiceChat not authenticating/connecting using playit

Hey guys!

I am trying to setup simplevoicechat but it just refuses to authenticate players, i have tried both using the MC simple voicechat tunnel and a straightup UDP tunnel with correct ports set.

And ofcourse adjusting the properties of voicechat to use that IP:port as server
and yes i have protocollib installed

Both times there seems to be no connection after starting my server with the voicechat, people are able to connect to the minecraft server with a seperate playit.gg tunnel but the voicechat tunnel just does not get a connection.

anyone else having this problem and know how to fix it?