HELP!! MinnowBooster, SteemConnect, Can't use any Daps on Steem!!!

Here is my little dilemma. If anyone happens to read this on Steemit, please do me a favor and help out. Here is the issue:

I have been unable to log into my steemit account using steemconnect, in order to use steem based daps like minnowbooster. I am able to log into the account no problem, using my chrome browser as my details have been saved. However, when I try to log into a new in a new browser, like Brave, I am given the message that my username is incorrect. I have quadripple checked to make sure that I am spelling it correctly.....the entire 10 letter sequence, and I have even changed my password. Nothing works.

I am no idea what the issue is and I would really be able to use other daps on the steem blockchain to support the projects. Any help in this regard will be greatly appreciated. THANK YOU!!!!!