For what it’s worth, TU’s app works even when their site is down, that’s how I ended up freezing my file again when their site was down when I had to unlock it for the myFICO reporting to start.
As for Experian, they require ID to give access to online features again but I thought that you could email that to them? Might be worth looking into.
I highly doubt they are locking you out on purpose, I ran into the same problem with Equifax the other day when I went to view my dispute results a second time. Most likely have me tangled up with my dad (I’m the second - suffix II - so the third party data collectors like LexisNexis almost undoubtedly have us nice and mixed up) and I’ll get around to pulling them some time this year.