Well, something more than 10

I have the Barclay AA Biz linked to my account but I get that message too with only 10 miles. Problem is they don't tell you what kind of balance you need to get into the good rates, just that you need to buy some, but like what's the minimum redemption amount?
No, nothing so fancy

While not all AF may be the devil, that Plat is definitely a minion of darkness at the moment. One day we'll succumb, but for now Priority Pass is our first foray into the lounge scene. Probably why I'm failing so spectacularly so far, sheer plebian inexperience