Incorrect username or password in Migration tool

Incorrect username or password in Migration tool

I keep on getting the error in the Access migration tool that says that I am typing in an incorrect username or password. As far as I can tell though, they are correct. I usually use my google account to sign in though, so there is a possibility the username I am using is incorrect. Is there a way to find the username that I am supposed to use in the tool? Any help would be greatly appreciated.