Alright, it seems up no one have an idea how to fix the mumble verification fail problem, it's happening to me and many users who are just asking in random places in the forums for help and not getting any.
If someone doesn't know, the mumble verification fail problem is when you are inside the tf2c mumble, and then clicking the verify me button and it says the verification was unsuccessful.
So my suggestion is, having another way to verify mumble, for the ones who automatic verification don't work for them, for example how about Manual Verification? You enter the mumble server and a Moderator/Admin inside the mumble checks you, if you are indeed able to connect the mumble server, then he lets you enter Mumble required lobbies, it isn't suppose to take much time.
So that's it, I am just hoping that me , and more users, will be able in the future to play Mumble required lobbies, I suggested this because it seems like the only chance we will be able to do so.
I've made a bug report, commented on the Mumble help topic, private messaged an Admin details about my problem when he asked to and yet no help. (And I am pretty sure other players searched for the same help of course)
Thanks for reading this topic, (Fully reading it would be appreciated)
Regards.