Set up dovecot auth

Hey,

I want to use the mod_auth_dovecot for the secure domain feature but I cannot login with my email/pw in Jitsi.

Log:

2020-06-15T10:49:07.890Z [modules/xmpp/xmpp.js] <connectionHandler>:  (TIME) Strophe connecting:	 21663 Logger.js:154:22
2020-06-15T10:49:07.932Z [JitsiMeetJS.js] <getGlobalOnErrorHandler>:  UnhandledError: null Script: null Line: null Column: null StackTrace:  Error: "Strophe: BOSH-Connection failed: host-unknown"
    log strophe.util.js:89
    error strophe.umd.js:1392
    _connect_cb strophe.umd.js:4697
    _connect_cb strophe.umd.js:3229
    _onRequestStateChange strophe.umd.js:5012
Logger.js:154:22
2020-06-15T10:49:07.935Z [modules/xmpp/strophe.util.js] <t.a/r.Strophe.log>:  Strophe: BOSH-Connection failed: host-unknown Logger.js:154:22
2020-06-15T10:49:07.936Z [modules/xmpp/xmpp.js] <connectionHandler>:  (TIME) Strophe connfail[host-unknown]:	 21709 Logger.js:154:22
2020-06-15T10:49:07.936Z [modules/xmpp/xmpp.js] <connectionHandler>:  (TIME) Strophe disconnected[host-unknown]:	 21709 Logger.js:154:22
2020-06-15T10:49:07.939Z [modules/UI/authentication/AuthHandler.js] <f/</n</<>:  authenticateAndUpgradeRole failed 
Object { connectionError: "connection.otherError", credentials: undefined, message: "host-unknown" }
Logger.js:154:22
2020-06-15T10:49:08.796Z [modules/xmpp/moderator.js] <u.prototype.setFocusUserJid>:  Focus jid set to:  undefined Logger.js:154:22
2020-06-15T10:49:08.797Z [modules/xmpp/moderator.js] <u.prototype.createConferenceIq>:  Session ID: null machine UID: 239b5c4ff6cd5eb3fa714630ad46d182

Any Ideas?

The host used to connect through bosh is not known for prosody

And how do I fix this?
Without auth there is no problem. I followed the secure domain guide.