MMS and group texts to iPhone are not being received
I just bought a brand new Galaxy Note10 two days ago. While it seems advanced messaging, MMS, and group text works fine with most people, some aren't receiving these from me. My mom, for instance, has an iPhone and also has AT&T. She is unable to receive groups texts or MMS from me, whether I have advanced messaging on or not.
My phone is up-to-date on the software and I have tried turning off advanced messaging, restarting my phone, deleting the group chat, and all combinations of the above. I also had her check to make sure my number is listed as "mobile" in her contacts and not "iphone". Basically, went through all the advice Google searches have to offer regarding this issue.