Hi, we recently upgraded two instances to 3.1.0.beta5 (286dfcacb4) and noticed the following issue regarding inboxes for group messages since then:
Go to your “personal messages”, e.g. https://discourse.example.com/u/gregory/messages 
 
Use the category selector on the top-left to select the inbox of some (arbitrary) group. 
Now we immediately get this: 
 
 
 
Nothing is actually logged to https://discourse.example.com/logs/ .
The browser console shows:
TypeError: Cannot read properties of undefined (reading 'name') @ application.js:79
 
Error while processing route: userPrivateMessages.group.index Cannot read properties of undefined (reading 'name') TypeError: Cannot read properties of undefined (reading 'name') @ router.js:1064
 
Uncaught TypeError: Cannot read properties of undefined (reading 'name') @ rsvp.js:23
 
 
The developer tools show a POST request to https://discourse.example.com/message-bus/35da09199d4b4a659887ec491695e8d5/poll  that does not receive any response from the server and after 25 seconds times out with response []. This then triggers another such POST request etc…
             
            
               
               
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              I think there’s been another report of this too - Cannot open the moderation inbox 
Let me see if I can get someone to take a closer look.   
             
            
               
               
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              Oh, I didn’t see the other post. Thanks a lot!
Interestingly, the “moderators” inbox is the only one that does  still work in our case 
             
            
               
               
               
            
            
           
          
            
            
              The moderation mailbox can be opened via the link example.com/g/moderators/messages/inbox . However, if you click on the link in the sidebar or on a notification, the aforementioned error appears. The link in the sidebar or in the notification is also structured slightly differently: example.com/u/username/messages/group/Moderators 
             
            
               
               
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              I have observed further:
If a moderator responds to a reply in the moderation inbox, the corresponding topic opens without any problems. No error message appears. The link looks different here too: example.com/t/title-of-the-topic/1234/4 
 
If a user reports a post and writes a message at the message because he selected Other, I can open the message in the mailbox as well. Again, the link looks like above: example.com/t/title-of-the-topic/1234/4 
 
 
So one can state: If a link is made directly to a topic in the moderation inbox, no error appears either.
             
            
               
               
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                tgxworld  
                (Alan Tan)
               
              
                  
                    June 19, 2023,  6:23am
                   
                   
              7 
               
             
            
              This has been fixed in
  
  
    
    
  
      
    
      discourse:main ← tgxworld:fix_error_when_viewing_group_inbox
    
      
        
          opened 06:21AM - 19 Jun 23 UTC 
        
        
        
       
   
 
  
    This is a follow up to 1cbc65ba7949b0763c13347339b3064826023c07 where
visiting a…  group with a mixed case name would result in an error. 
   
   
  
    
    
  
  
 
Thank you for the report @GregoryS 
             
            
               
               
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                tgxworld  
                (Alan Tan)
                  Closed 
               
              
                  
                    July 3, 2023, 12:00am
                   
                   
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