Speaking of security theater... A few years back I got a Yubikey for Vanguard log ins.
Useless.
It was a lot of theater alright. Insert key/enter pin/touch key. Yeah!
Recently, it stopped working. Oh no! Now what? Oh yeah, I had an extra in the safe. Too much work. Let's see if I can reset my password. So during my log in, there was a link that said "Trouble logging in?" or something like that. Pressed it, gave it some info, got an MFA ping back to my phone and I was logged in. The first thing I did was disable the Yubikey.
The whole hardware key thing was useless since they let me reset my login so easily. Sure, there was the MFA to my phone, but see OP's OP. That was all about the scammer getting the MFA from you. MFA is theater too.