If your fitter can’t get you in the right tee height, you should probably get fit elsewhere…
Last driver fitting I did the second conversation we had was tee height… the first was him pulling the brand of ball i play.
There is no licensing to be a golf fitter! You have to find someone who you can work with and trust they know what they are doing… if they aren’t replicating your real world setup, they are just wasting time.