I can confirm the "Realm ID" reset solution. You'll need to chat with support. Specifically the payroll support chat (I had to wait another hour after being on hold with general support chat) this is the link: https://help.quickbooks.intuit.com/prechats/offerings/Messaging-DIY-Payroll/23062/view

They'll ask to remote into your computer to update it. They'll check some info and then you'll go to Help / Reset Intuit ID Settings / type ctrl R and enter the new number they give you. Then they'll have you log back into your quickbooks.com intuit account to update it and you can go forward with the update information. Btw, the Realm ID appears to just be the Company Intuit ID under account information when you hit F2 in Quickbooks. You'll still need to get the new number from support though. Have fun!