International SMS-type texts are often flakey and often at the whim of either service providers and the government(s) of the day. They're also unencrypted and subject to surveillance. Oman isn't known to be hostile to americans, but if the information going in between (and the subject of the said information) is sensitive enough, it could in theory, be flagged. Don't want to get too into the weeds for this, but something you should be aware of.

My suggestion would be to flip over to a secure messaging app like Signal or whatsapp (more the former than the latter). Communications are encrypted. NOTE: the messages can be edited to a certain extent. If you need to document conversations (eg, CYA), make sure you use a different method of documenting the conversation.