Around the time of the Android 15 update (recently, in other words) all my group outgoing messages stopped sending. I posted about it here: https://discuss.grapheneos.org/d/16958-mms-misbehaving-in-secondary-profile-in-graphene-15 and apparently sending from secondary profiles is well-known to be unreliable. Weirdly, I can't find a Github issue for this on the tracker.

I am using the standard Graphene Messages app.

Today, testing a bit more, I can't send group message at all, even from my main profile. The error in the UI is "Not sent. Tap to try again."

I can send and receive messages to and from individuals just fine. I don't have an exotic configuration. Everything has worked for months until recently. This is really frustrating. I am out of ideas. I'm willing to switch carriers to stick with this Project, but to whom? And moreoever I would kinda like to know that there's a plan upstream to address this issue, because it is a showstopper for me. I'm happy to share a log if that's helpful.