MMS not working on Samsung S10e

My wife and I each have a Samsung S10e, though they were purchased a few weeks apart. Mine receives photos and large messages just fine. Hers does not.

I've tried both the default Samsung messages app that comes with the phone and Google's messages app downloaded from GooglePlay. The Google app shows a progress circle going endlessly round and round. The Samsung app actually shows the message size and identifies it as MMS, but never displays it.

I have compared every setting I could find that might apply and all are the same.

Any idea what might be wrong?

Thanks.

 

Every setting I could find that might apply. I didn't find this one.

And they are different! The one with working MMS is set to "T-Mobile US LTE" and the one that is not working is set to "Ting Data". (We get our service through Ting.com which is a T-Mobile reseller or some such arrangement.) But I don't know if I can just add the T-Mobile APN and copy its settings or if there is more to it than that.

Thanks!

 

Well it was certainly worth a try, but I made the APN settings identical and it still does not download MMS. (Photo)