You can send an invite to the email address you want to access all your companies with, dlmauer. The subsequent discussion will guide you on how to sign in to each of your companies using unified login credentials.
QuickBooks Online (QBO) allows you to create multiple companies under one Intuit account or user ID. Since your companies currently use different sign-in credentials, you can move the other one to the email address you want to access them. We will call this preferred email "email A" and the obsolete email "email B."
Beforehand, note that only the company admin can send invites. Also, ensure you have an Intuit Account with email A.
To begin with, here’s how to send an invitation:
- Access your QBO company under email B to invite email A.
- Select the Gear icon, then Manage users.
- Click the Add user button and provide the details in the Enter personal info section.
- Choose a user type in the dropdown from the Assign roles section. You can select Company Admin if you want email A to manage other users and company info.
- Select Send invitation, then Send invite to confirm the action.

After that, open your inbox for email A to accept the invitation.
You can change the primary admin and remove email B since you can now access the company using email A. Although this process is optional, I'll add this article here for the complete instructions: Use one user ID to access multiple companies in QuickBooks Online.
Moreover, this guide will show you how to modify your business name, contact information, or Employer Identification Number (EIN) to keep them updated: Change your business name, contact info, or EIN in QuickBooks Online.
Furthermore, optimize your workflow and increase productivity with QuickBooks Live Expert Assisted. This service gives you access to knowledgeable experts who can assist you in navigating the software and performing essential business functions effectively.
If you require additional assistance managing your QuickBooks Online company files, drop us a line by clicking the Reply button below. We’re constantly watching this thread and will get back to you as soon as possible.