Who I have the same questioned this topic

This happens with only 1 of my contacts. I am able to text everyone else fine. I have tried 3 different messaging apps. I have tried to power cycle my phone. I have been trying to text this person every other day for about a week, so where I am physically at or when I am trying to send it does not matter. I tried sending with a 1+ area code+ number and area code+ number. Nothing works.

Suggestions?