If it shows that the person is unavailable on messenger it doesn’t mean that you are blocked by the user. There are many reasons that lead to this issue. Maybe the user is temporarily unavailable at the messenger or Facebook has suspended its account. To solve “person unavailable on messenger”: 

1. Check if you are blocked by the person 

2. You have to check that you haven't blocked the user

3. Check your internet, if it is connected well to the network or not

4. Update your messenger app

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