@Edent This is a great scam, and probably effective a good percentage of the time.
It reminds of a story I wrote about a tech expert who got scammed b/c he refused to hang up when the scammers called. Instead, he put the scammers on hold and called his bank and asked them if they were in support call with him already, and they checked and said yes. Feeling better, he went back to the original caller and proceeded to give them what they needed to take over the account.
What he didn't count on was that the scammers were also on the phone with his bank at the same time --- pretending to be him! So the bank was answering truthfully, from their perspective.
This wrinkle just seems to add some app magic into it, which is brilliant.