IPhone - iMessage just not working with one person?

I was texting someone today and yesterday and iMessage hasn't been working with them it ends up sending as a text message but it's been working with everyone else that I text that has iMessage. The person I'm trying to message is in Florida.

Is the problem on my end or theirs?

The problem is that person… I believe they either do not have a well working internet coverage or maybe they have imessage turned off on their device. Tell that person to do the following:
settings --messages -- make sure imessage is turned on

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