How has one of my contact's text notifications been switched off on my Samsung Galaxy S7?

There is a mute symbol next to the name of one of my contacts in my messages file and I'm not getting notifications for messages. I have no idea how this got switched on, plus I'd like to turn it off but no idea how to do that either!!!

Open Phone app > More > Settings > Call Blocking > Block list. Check if the muted contact is there. Maybe you accidentally blocked him/her.

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