Previously Caseta used the Lutron app but RA2 would use the Lutron Connect one so all was well.

I now have RA3, but to use it or activate devices, you must use the Lutron app also. If I'm logged into my Caseta account, you must fully sign out and then sign back in to access RA3 devices. Then to go back to Caseta to use my Serena shades or other, you must also fully sign out and then sign back in as Caseta.

This can't be correct, am I doing something wrong?

The only difference is Caseta is a Home Owner account, where RA3 is my Lutron professional one I use in the designer software. I don't know if I have a Home account for RA3 or how to even make one, as my only email address is the one I use for professional.