Subdomain feature in jitsi

@damencho @saghul

Can you help me here, I see below errors in jicofo after enabling subdomain (multi domain ) in jitsi. The meeting crashes when I use subdomain in the meeting URL.

Caused by: org.jivesoftware.smack.XMPPException$XMPPErrorException: XMPP error reply received from muc.test.test.mydomain.com: XMPPError: not-allowed - cancel
at org.jivesoftware.smack.XMPPException$XMPPErrorException.ifHasErrorThenThrow(XMPPException.java:132)
at org.jivesoftware.smack.StanzaCollector.nextResultOrThrow(StanzaCollector.java:263)
at org.jivesoftware.smack.StanzaCollector.nextResultOrThrow(StanzaCollector.java:214)
at org.jivesoftware.smackx.disco.ServiceDiscoveryManager.discoverInfo(ServiceDiscoveryManager.java:540)
at org.jivesoftware.smackx.disco.ServiceDiscoveryManager.discoverInfo(ServiceDiscoveryManager.java:506)
at org.jivesoftware.smackx.disco.ServiceDiscoveryManager.supportsFeatures(ServiceDiscoveryManager.java:748)
at org.jivesoftware.smackx.disco.ServiceDiscoveryManager.supportsFeatures(ServiceDiscoveryManager.java:744)
at org.jivesoftware.smackx.disco.ServiceDiscoveryManager.supportsFeature(ServiceDiscoveryManager.java:740)
at org.jivesoftware.smackx.muc.MultiUserChatManager.providesMucService(MultiUserChatManager.java:361)
at org.jivesoftware.smackx.muc.MultiUserChat.enter(MultiUserChat.java:311)
at org.jivesoftware.smackx.muc.MultiUserChat.createOrJoin(MultiUserChat.java:498)
at org.jivesoftware.smackx.muc.MultiUserChat.createOrJoin(MultiUserChat.java:444)
at org.jitsi.impl.protocol.xmpp.ChatRoomImpl.joinAs(ChatRoomImpl.java:240)
… 17 more
Jicofo 2021-01-14 20:41:51.561 WARNING: [52] org.jitsi.jicofo.xmpp.FocusComponent.processIQ() (serving component ‘Jitsi Meet Focus’) Unexpected exception while processing IQ stanza:
net.java.sip.communicator.service.protocol.OperationFailedException: Failed to join the room
at org.jitsi.impl.protocol.xmpp.ChatRoomImpl.joinAs(ChatRoomImpl.java:298)
at org.jitsi.impl.protocol.xmpp.ChatRoomImpl.join(ChatRoomImpl.java:209)
at org.jitsi.jicofo.JitsiMeetConferenceImpl.joinTheRoom(JitsiMeetConferenceImpl.java:581)
at org.jitsi.jicofo.JitsiMeetConferenceImpl.start(JitsiMeetConferenceImpl.java:404)
at org.jitsi.jicofo.FocusManager.conferenceRequest(FocusManager.java:477)
at org.jitsi.jicofo.FocusManager.conferenceRequest(FocusManager.java:426)
at org.jitsi.jicofo.FocusManager.conferenceRequest(FocusManager.java:401)
at org.jitsi.jicofo.xmpp.FocusComponent.handleConferenceIq(FocusComponent.java:417)
at org.jitsi.jicofo.xmpp.FocusComponent.handleIQSetImpl(FocusComponent.java:254)
at org.jitsi.xmpp.component.ComponentBase.handleIQSet(ComponentBase.java:362)
at org.xmpp.component.AbstractComponent.processIQRequest(AbstractComponent.java:515)
at org.xmpp.component.AbstractComponent.processIQ(AbstractComponent.java:289)
at org.xmpp.component.AbstractComponent.processQueuedPacket(AbstractComponent.java:239)
at org.xmpp.component.AbstractComponent.access$100(AbstractComponent.java:81)
at org.xmpp.component.AbstractComponent$PacketProcessor.run(AbstractComponent.java:1051)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.jivesoftware.smack.XMPPException$XMPPErrorException: XMPP error reply received from muc.test.test.mydomain.com: XMPPError: not-allowed - cancel
at org.jivesoftware.smack.XMPPException$XMPPErrorException.ifHasErrorThenThrow(XMPPException.java:132)
at org.jivesoftware.smack.StanzaCollector.nextResultOrThrow(StanzaCollector.java:263)
at org.jivesoftware.smack.StanzaCollector.nextResultOrThrow(StanzaCollector.java:214)
at org.jivesoftware.smackx.disco.ServiceDiscoveryManager.discoverInfo(ServiceDiscoveryManager.java:540)
at org.jivesoftware.smackx.disco.ServiceDiscoveryManager.discoverInfo(ServiceDiscoveryManager.java:506)
at org.jivesoftware.smackx.disco.ServiceDiscoveryManager.supportsFeatures(ServiceDiscoveryManager.java:748)
at org.jivesoftware.smackx.disco.ServiceDiscoveryManager.supportsFeatures(ServiceDiscoveryManager.java:744)
at org.jivesoftware.smackx.disco.ServiceDiscoveryManager.supportsFeature(ServiceDiscoveryManager.java:740)
at org.jivesoftware.smackx.muc.MultiUserChatManager.providesMucService(MultiUserChatManager.java:361)
at org.jivesoftware.smackx.muc.MultiUserChat.enter(MultiUserChat.java:311)
at org.jivesoftware.smackx.muc.MultiUserChat.createOrJoin(MultiUserChat.java:498)
at org.jivesoftware.smackx.muc.MultiUserChat.createOrJoin(MultiUserChat.java:444)
at org.jitsi.impl.protocol.xmpp.ChatRoomImpl.joinAs(ChatRoomImpl.java:240)