Yes, you can use your prior User ID and password for your IRS online account.
I have a User ID and password crested well before for the ID.me fiasco and it works fine.
When accessing your account you will need to enter your User ID and Password. Then the IRS will have verification number sent to you as a text to your cell phone or if you did not register a cell phone when originally creating your User ID it can be sent by a phone call.
