I've noticed the most typical thing that prevents a plan with a high deductible from qualifying for an HSA is prescription drug coverage that's active before you meet the deductible. Just a health insurance-negotiated discount is fine, but not when they pay a portion of the cost. I say it's the most typical thing, because it's also what people are most concerned about. You can spend a lot of money in a year on prescription medicine without reaching the deductible, so people don't like that none of it is covered.
But there are other things too, I'm looking at that emergency room copay with a side eye. If it's active before you meet the deductible, then that would be enough to disqualify it.
As a curiosity, it's interesting to see what (desirable?) trait is keeping an otherwise-qualifying plan from qualifying. But generally, your health insurance company *knows* when they are or are not providing an HSA-eligible HDHP plan, and will tell you, and pair it with an HSA account. Next year marks the 20th anniversary since the introduction of HDHP plans and HSAs, so none of this is new to them.
