Jitsi call between servers in federation mode is not working

Description:

Hi,

Jitsi is enabled on our servers.
It's working well between users on the same server.
But when clicking "Video Chat" in a chat with users from servers in federation, users on remote server don't see the "click to join !"

Steps to reproduce:

On the first server we launch the video chat:

On the remote server there is no "click to join !":

Server Setup Information:

• Version of Rocket.Chat Server: 3.0.12
• Operating System: Ubuntu Server 18.04
• Deployment Method: Manual Install
• Number of Running Instances: 2
• NodeJS Version: 12.14.0
• MongoDB Version: 4.0.17

Relevant logs:

On log we have this:

Exception while invoking method 'jitsi:updateTimeout' TypeError: resource.mentions is not iterable at Object.normalizeMessage (app/federation/server/normalizers/message.js:62:33) at app/federation/server/hooks/afterSaveMessage.js:22:102 at /opt/Rocket.Chat/programs/server/npm/node_modules/meteor/promise/node_modules/meteor-promise/fiber_pool.js:43:40 => awaited here: at Function.Promise.await (/opt/Rocket.Chat/programs/server/npm/node_modules/meteor/promise/node_modules/meteor-promise/promise_server.js:56:12) at callback (app/federation/server/hooks/afterSaveMessage.js:33:39) at callbacks.runItem (app/callbacks/lib/callbacks.js:110:70) at Object.callbacks.runItem (app/metrics/server/callbacksMetrics.js:24:20) at app/callbacks/lib/callbacks.js:39:35 at app/callbacks/lib/callbacks.js:45:45 at app/callbacks/lib/callbacks.js:45:47 at callbacks.run (app/callbacks/lib/callbacks.js:126:9) at Object.callbacks.run (app/metrics/server/callbacksMetrics.js:14:17) at MethodInvocation.jitsi:updateTimeout (app/videobridge/server/methods/jitsiSetTimeout.js:42:14) at MethodInvocation.methodsMap. (app/lib/server/lib/debug.js:67:34) at maybeAuditArgumentChecks (packages/ddp-server/livedata_server.js:1771:12) at packages/ddp-server/livedata_server.js:719:19 at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js🔢12) at packages/ddp-server/livedata_server.js:717:46 at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js🔢12) at packages/ddp-server/livedata_server.js:715:46 at new Promise () at Session.method (packages/ddp-server/livedata_server.js:689:23) at packages/ddp-server/livedata_server.js:559:43

Thanks !

Start by reading app/federation/server/normalizers/message.js and the afterSaveMessage.js hook, then trace the jitsi:updateTimeout call in app/videobridge/server/methods/jitsiSetTimeout.js. Reproduce the federated Jitsi call and verify that the remote users receive the “click to join!” prompt without the resource.mentions error.