Prepaid international roaming works in theory but is problematic in practice. Is your account set up for WiFi Calling? You should be able to receive texts via WiFi.
Hey there! Sorry to hear you are having trouble getting your text messages! Is it just short codes or are you also unable to receive text messages from other phone numbers?
We wanna make sure we get you help. Chris and drnewcomb2 asked some great questions. Please let us know if you need more assistance.