Federation test runs ok but invite users fails

Description:

I am testing federation in a lab.
I have two rocket servers running rocket 3.1.1
I've added the two records for each domain (SRV and TXT).
Federation test works but when I invite a users from the federated domain It fails.

Steps to reproduce:

1. Install Centos 7 and rocket using manual installation.
2. Create two zones domain1.com and domain2.com internal for test purposes.
3. Federate both servers.

Expected behavior:

When I invite a user from the federated domain It should work but fails.

Actual behavior:

Test working:

Adding federated user:

Doing double clic on the federated user:

Server Setup Information:

• Version of Rocket.Chat Server: 3.1.1
• Operating System: Centos 7
• Deployment Method: https://rocket.chat/docs/installation/manual-installation/centos/
• Number of Running Instances: two rocket servers called rocket1 and rocket2
• DB Replicaset Oplog:
• NodeJS Version: v12.14.0
• MongoDB Version: 4.0.18

Both rocket chat servers are in the same network, using the same dns
rocket1 -> 192.168.122.110
rocket2 -> 192.168.122.120
dns -> 192.168.122.1

Record examples using bind9:
Domain1:

rocket1.domain1.com.	IN	A	192.168.122.110
_rocketchat._http.domain1.com. 3600 IN SRV 1 1 3000 rocket1.domain1.com.
rocketchat-public-key.domain1.com. IN TXT '-----BEGIN PUBLIC KEY-----MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA1S597MBanxGChpFGBGlb3MVOxRhObtMdVWocJWlnstkkFVRuPtEKIEu1Y5TV6+HKgL8hAOH8g46St4+Lbi0KGlNTVMdT4clbFyQos+BWgVpyS/aEy6cpQv5LuH1+WBBk3tpm6rNXUYaa9PiU/7MkskFwZw+a/1Ua'
rocketchat-public-key.domain1.com. IN TXT 'HYKFaZ87terVCQhydFbBPOvL8wDUAc0c5ZzjFrH9wntbr+zp+Kpq63/jawJk8pWy2xPWCC61eFpRBaRXch6M89xW2AilyZ4gjtNw/D4YNOciMffS9WlNIE64+DsHwV/9dJel8rTgKVzHovJvMs64FgZu5lM1OmK6HnuTGrF0GMzhSZPA9rdU/wIDAQAB-----END PUBLIC KEY-----'

Domain2:

rocket2.domain2.com.	IN	A	192.168.122.120
_rocketchat._http.domain2.com. 3600 IN SRV 1 1 3000 rocket2.domain2.com.
rocketchat-public-key.domain2.com. IN TXT '-----BEGIN PUBLIC KEY-----MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAiUiEAj/Up8LG9cFWk8qXz+bQFtW+B9Eb4Mp3OSe40bwz1X8wSvXOab5xgH9RtAdGIjtifi63VD4MsiNUTBrCA6XvGwl9c1vWhJFudRLhMmYBJK4WXMzhYl+/F3c3my9bHfzbtWykDXUe6JGJZJ9RSsGdhoxAdTu/h'
rocketchat-public-key.domain2.com. IN TXT '8nFQRqwk8bglDrL5msxyR5LqCOztRt/ewA2kOoLLCI8At6hTQ6OuMfUcQOdb/hlM6EajWN8gRR7y3Y/aF4CC+sDPnMN5CtrqWq8ZFvtDSTZ6xWOI5+NMaEGhcPfo1sBKMjliic1TWAdEx1rPemS54niS/Vps9xj5XjySl8nDEYROj0HsP2UNwIDAQAB-----END PUBLIC KEY-----'

Client Setup Information

• Browser Chrome: 80.0.3987.163
• Operating System: Centos 8.1

Relevant logs:

When the error happens server side:

Apr 15 17:37:35 rocket2.domain2.com rocketchat[3833]: server.js:204 Federation ➔ http.error Error Error: failed [400] {"success":false,"error":"Cannot read property '0' of undefined"}
Apr 15 17:37:35 rocket2.domain2.com rocketchat[3833]: Exception while invoking method 'createDirectMessage' Error: failed [400] {"success":false,"error":"Cannot read property '0' of undefined"}
Apr 15 17:37:35 rocket2.domain2.com rocketchat[3833]: at Object.exports.makeErrorByStatus (packages/http.js:176:10)
Apr 15 17:37:35 rocket2.domain2.com rocketchat[3833]: at Request._callback (packages/http.js:140:24)
Apr 15 17:37:35 rocket2.domain2.com rocketchat[3833]: at Request.self.callback (/opt/Rocket.Chat/programs/server/npm/node_modules/meteor/http/node_modules/request/request.js:185:22)
Apr 15 17:37:35 rocket2.domain2.com rocketchat[3833]: at Request.emit (events.js:210:5)
Apr 15 17:37:35 rocket2.domain2.com rocketchat[3833]: at Request.EventEmitter.emit (domain.js:475:20)
Apr 15 17:37:35 rocket2.domain2.com rocketchat[3833]: at Request.<anonymous> (/opt/Rocket.Chat/programs/server/npm/node_modules/meteor/http/node_modules/request/request.js:1161:10)
Apr 15 17:37:35 rocket2.domain2.com rocketchat[3833]: at Request.emit (events.js:210:5)
Apr 15 17:37:35 rocket2.domain2.com rocketchat[3833]: at Request.EventEmitter.emit (domain.js:475:20)
Apr 15 17:37:35 rocket2.domain2.com rocketchat[3833]: at IncomingMessage.<anonymous> (/opt/Rocket.Chat/programs/server/npm/node_modules/meteor/http/node_modules/request/request.js:1083:12)
Apr 15 17:37:35 rocket2.domain2.com rocketchat[3833]: at Object.onceWrapper (events.js:299:28)
Apr 15 17:37:35 rocket2.domain2.com rocketchat[3833]: at IncomingMessage.emit (events.js:215:7)
Apr 15 17:37:35 rocket2.domain2.com rocketchat[3833]: at IncomingMessage.EventEmitter.emit (domain.js:475:20)
Apr 15 17:37:35 rocket2.domain2.com rocketchat[3833]: at endReadableNT (_stream_readable.js:1184:12)
Apr 15 17:37:35 rocket2.domain2.com rocketchat[3833]: at processTicksAndRejections (internal/process/task_queues.js:80:21)

The report identifies server.js, packages/http.js, and the createDirectMessage method in the server log; start by tracing that federation request and reproduce it with the two-server setup described. Done means inviting a user from the federated domain completes without the reported 400 error.