The wifi connection is good I cleaned the cache and still can't send MMS. on my galaxy S10+ everything works good only with this phone and this number not on the other one don't know what else to do
Same problem on 2 of my 3 Samsung galaxy a32 5g phones. Unable to send or receive MMS messages while on wifi hotspot tmobile CF-66. Immediately works when I set mobile data on, regardless of wifi set to on or off.