Clear all cookies, and then go to https://twitch.tv/login
Log into your blanketyblankman account there.
When you come back here, just "log in with my twitch account" and it should put you directly in.
If you log into twitch and it doesn't say "blanketyblankman" at the top right, then the issue is that you have a different twitch account you're logging into. If you've accidentally set up a different twitch account, let me know and I can unmerge them so that when you come in, you can give it control of the Lithl account.
I don't have a Twitch account named blanketyblankman. The account I merged with MTGS was named "requirestwitch".
The only reason my Twitch account exists in the first place is because MTGS forced me to create it in order to continue using these forums, a fact that continues topissme off. I don't want anything to do with Twitch, and now I've been forced by necessity to create a second Twitch account just to report an issue with logging in using the first Twitch account I didn't want.
When I try to log in with my Twitch credentials, I'm told I need to set up my MTGS account.
This is the same behavior described here: https://www.mtgsalvation.com/forums/community-forums/community-discussion/forum-software-feedback-and-bug/784710-login-trouble however the solution proposed by Feyd_Ruin in that thread is inapplicable to me.
The only reason my Twitch account exists in the first place is because MTGS forced me to create it in order to continue using these forums, a fact that continues to piss me off. I don't want anything to do with Twitch, and now I've been forced by necessity to create a second Twitch account just to report an issue with logging in using the first Twitch account I didn't want.