Employer UTR request

Hi hive mind, I've had a request from somebody who I freelance for for my UTR number, and they've specifically requested I take a screenshot of it off my HMRC app or send them a picture of the letter so they can verify it with my address. This was a bit strange to me, so I asked why and they said they were required by HMRC to provide this information (my UTR) on their quarterly returns. I was under the impression that I didn't need to provide people I work for with my UTR, and having spoken to a couple of people on the HMRC Employer Advice line they are of the same thinking. Is this something they should be asking for?

Hi 

It would depend on the type of working you are doing, if you are working in the Construction Industry Scheme they require your UTR to check you are registered.
If they can't point you to guidance that indicates you must give them the UTR, you don't need to.

Thank you