Phone doesn't receive 2fa messages, bank codes, etc.

This is chinese Xiaomi Mi Max 3 with unlocked bootloader which came with global miui (Android 8.1).

What I've tried:

  • checking sms center number
  • disabling MIUI optimizations
  • changing settings of messaging app (disabling block list, enabling miui sms)
  • disabling volte
  • installing alternative sms apps
  • changing sim slots
  • reflashing global miui via fastboot with full wipe

I was able to fix this on another Mi Max 3 with chinese 8.8.9 ROM by disabling MIUI optimizations if I remember correctly, but it doesn't work on this one...

Any idea how to fix this?

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