FHA loan for 2-4-unit with co-signer to live in?

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I'm guessing answer is no but want to make sure if any of you know...

We own a townhome and want to buy a 2-4 unit investment property but were told that you can't get an FHA loan for 2-4 units after having a conventional loan for a single family residence... AND we have a good friend who has never owned property before but wouldn't be able to qualify for a home on his own...so we thought about co-signing together on an FHA 2-4 units and having him live in one unit for at least a year and managing it and going forward together or taking it over exclusively after the one year... but is this allowed or can we not co-sign for an FHA loan and not live in it and later take it over... does that make sense?

Thanks in advance for your help! We are wanting to do this in Utah County near the universities... thanks!