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I have a note 20 ultra but it was happening with a s20 ultra also before this. If my girlfriend uses chat features on Android messages on her pixel 3A, I can't receive messages from her if I'm using Samsung messages. I have to use Android messages. I've had this problem for a while and have tried different things but I've never found a workaround. I use mint mobile which sometimes I think might have something to do with it.
Just for reference, I've tried resetting Network settings, doing a factory reset, using mint mobile network settings and also just using default Network settings. I've noticed if she turns off chat features on her pixel 3a, I can get messages from her when I'm using Samsung messages. But she doesn't want to turn off chat features so I'm stuck using Android messages on my note 20 ultra instead of Samsung messages.