If I am reading Reg B (and the several threads on here that pertain to this topic) correctly, if you have a prequal application you don't ask for DI at the time of application because it isn't a true application per Reg B at that time. However, if it is denied, it becomes an application per Reg B and DI is required. How do you do this? You surely can't be expected to go back to the applicant and ask them to give you DI when you tell them their app is denied.

Just wanted to see how other banks are complying with this. Not getting it at all on prequals? Getting it every time? Other?

We've discussed this here several times. I recommend you do collect GMI/DI on prequalifications for the reasons you state.