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Hello, @annpacheco.

Let me share some information so your authorized users can log in to your QuickBooks company file all at ones.

Just to clarify, what QuickBooks version you're using? 

If you're using QuickBooks Desktop, one of the reasons mentioned by my colleague @Kristine Mae may have caused the error. Let's perform verify and rebuild to isolate any possible data damage or corrupted data.

Here's how:       

          1. Create a backup copy of your company file.

          2. Ensure your QuickBooks software is updated to the latest release version.

          3. To verify the data

                a. Click the File menu.

                b. Select Utilities.

                c. Choose Verify Data.

                d. If the Verify Data pop-up window appears, just click OK.

          4. To rebuild the data

                a. Go to the File menu.

                b. Choose Utilities.

                c. Select Rebuild Data.

                d. QuickBooks will prompt you to create a backup copy, click OK.

                e. Follow the on-screen instructions to complete the backup. 

                f. Once the process is complete, click View issues.

                g. Close the QuickBooks Verify/Rebuild Results window.

          5. Close and open QuickBooks again to ensure all components are updated.

          6. Identify damaged transactions based on the QBWin.log.

          7. Apply the appropriate fix on the transaction/s. 

For more detailed steps, you can read through this article: Resolve data damage on your company file.

However, if you're using QuickBooks Online, I've got this chart of usage limits depending on the subscription you have.

Also, you can refer to this article for more insights: What are usage limits in QuickBooks Online?

Meanwhile, I've got this article to learn more about provisioning user access in QuickBooks: Add, delete, or change user access for QuickBooks Online.

Keep me posted if you have other questions. I'm always here to help.