Adding guests to channels and teams -> limit reached

Description:

I create a user as admin with the role Guest. I want to add this user to a channel or team with /invite @test.user or via the web gui Add User.

After that Rocket.Chat gives me the following message.

error-max-rooms-per-guest-reached

Steps to reproduce:

1. Go to a channel (public/private)
2. Type the command /invite @test.user
3. Error message appears in the channel

Expected behavior:

That the user is added.

Actual behavior:

Is not added and an error message comes.

Server Setup Information:

• Version of Rocket.Chat Server: 6.3.3
• Operating System: Ubuntu 20.04 - Server
• Deployment Method: snap
• Number of Running Instances: 1
• DB Replicaset Oplog: 0
• NodeJS Version: v14.21.2
• MongoDB Version: 5.0.15 / wiredTiger (oplog Enabled)

Client Setup Information

• Desktop App or Browser Version: Both and all Versions
• Operating System: All

Additional context

Rocket.Chat app, not the server, runs in German in my profile.

Relevant logs:

No logs found that could help.

No files or tests are named. Start by reproducing the issue through /invite @test.user and the web GUI Add User, then trace the paths using error-max-rooms-per-guest-reached as the search term. Done means a Guest user can be added to a channel or team without that error.