Have you called Sonos Support directly to discuss it? I don’t own a Sub gen 4, I can’t confirm either way. 

It is telling to me that it does show the ‘remove sub’ button, and ‘add a second Sub’. That suggests that it is connected, I wonder if it is possible the ‘details’ you seek just aren’t there. But it does seem unusual, the details do appear for my ‘older’ version subs. 

Hi, Thank you for checking with your older sub.

If anyone has a Sub 4 + Arc gen1 combo, I would appreciate it if you could take a look for me.

I am awaiting further instructions level 2 support at the moment. Level 1 support did not have Sub 4 + Arc gen1 combo to test and the troubleshooting steps did not resolve the issue. We did discover that the details are showing for the Sub 4 + Era 100 combo, however. 

 

Hi ​@Ivan12093 

I can confirm the details for my four (4) Sub 4’s bonded to my three (3) Arc Ultra’s with Era 300 surrounds do not appear.

However, I can see details for my three (3) Sub-Mini’s bonded to my Beam2 with Era 100’s, Sonos Amp with turntable/3rd party speakers and Era 100 stereo pair. I also see details for a Sub (Gen3) bonded to my Era 300 stereo pair. 

Please update this thread when you hear back from Sonos Tech Support (STS). Feel free to add my comments to the investigation. I’ll try to contact STS as well as they escalate things when multiple concerns about the same oddity are voiced.

Thank you for checking!

I am still waiting for that email from Sonos Tech Support, but something tells me it’s not coming. I will likely need to reach out to them again.

It’s been 4 days since your original post. I’d reach out to STS again using the same support ticket.