http://community.kabam.com/forums/showthread.php?201561-Known-Issues-and-Bugs-READ-ME-FIRST#1

The 20th

It really pisses me off... I had lvl 50 humanoid with tons of t6s/t12s...

This post was edited by Geeyummy on Aug 2 2014 10:30am

Should work on steam, it just means that you can't link your STEAM to WEB.

You considered being on the wrong steam account ?

This post was edited by Oziris on Aug 2 2014 10:40am

Nah.. Many people have the same problem, I was just wondering if someone figured out a solution.

Well you posted the wrong problem, so it is hard to find a solution The problem you posted is that you can play on steam but can't play on any other platform, which is what my friend is trying to fix. But yours says your steam isn't linked to any account... and this account is not linked to any email...

No.. when I try to play on steam they ask for an email when I press play, but the thing is that its impossible to register an email in the first place.. So I'm screwed.

I had a ton of issues with this game and steam. It took something like 4+ weeks of talking to Kabam support and even then my issue was only partially resolved.
It was a different issue then the one you have, so I can't really help you. But man, I know how frustrating it can be.