I didn’t know I had to register. The IRS had my info on file for the first round of stimulus payments so I figured they’d just do the same thing this time around. Apparently you’re supposed to register for it? The wording is unclear to me. But the response after filling in that form, at least for me, was that they are mailing the check and not direct depositing it.
It seems that they're direct depositing it into the same account you got your check last time (at least for me)