Within the last week or so, group texts (MMS) have stopped working properly on my S21. I narrowed it down to when WiFi calling is enabled. Phone calls work as expected, as do regular text messages (SMS). I have restarted the phone, reset network settings, cleared cache/data for the messaging app, tried switching from Samsung's messaging app to Google's, and same issue. Turning off WiFi calling is the only way to get MMS working properly again.
I will get notifications of new MMS messages coming in, individually from each member where it will ask me to download the message, but if you click download it just spins until a network failure message comes up. If I turn off WiFi calling and click download again, it will properly grab the MMS message and put it in the group chat as expected.
Nothing else has changed with my home network that would explain this. I am using Telus fiber internet as well.
I'm a fairly technical guy so I've tried all the usual troubleshooting steps for network issues but it seems like the connection for MMS is simply being blocked somewhere along the network. Any suggestions? Is this just me or is anyone else having this issue recently too?