We can change it within your company file if it's just the same EIN. You can follow these steps:
From the Company menu, click on My Company.
Click the edit/pencil icon. On the pop-up. update the Contact Information and Legal Information.
Hit OK to save it.
In addition, it seems that you tried to update it on the camps.intuit.com but you were locked out. If so, you can reset your password or User ID so you can log in. On the sign in page, select I forgot my user ID or Password and enter the phone number or email address. Select Continue and follow the on-screen instructions. I have articles here for more details about CAMPs: