I have a MIMAX3 phone, recently, I changed my app for SMS to "Messenger for messages" from "messaging" that is, I assume, the app from Xiaomi.
My question is what can I do to repair it? For SMS from my country, e.g. to enter in gov. sites with an SMS code, it works fine.
After reading in the chat about the possibility that the problem is linked to the app, I deleted the messenger for messages, and the messages I receive are the same.
Edit. I came back to the regular SMS app for xiaomi phone and the problem weren't solved. I contacted my telephone operator and they say that if a SMS is received, it's not a problem related to them. They have nothing to do with the content of the messages. I contacted the support team of Dropbox, and they weren't able up to day to understand what is the problem. I am very surprised. I have also uninstalled and reinstalled the dual identification and the problem remained.