Can anyone explain how to fix an error I am getting with trying to set up my company information. It says authorisation ID does not exist

Welcome and thanks for visiting the Community, @joannamillin-gma.

To check if this is a browser-related (cache and cookies) issue, try signing into your QuickBooks Online (QBO) using a private browser (incognito). There are times that the browser is already full of frequently accessed page resources, causing some unusual responses.

Here's how:

• Press Ctrl + Shift + N (Google Chrome).
• Ctrl + Shift + P (Firefox).
• Control + Option + P (Safari).

Once logged in, proceed with setting up your company information again to double-check. Here's an article that you can check out for further guidance: Change company name, address, email address, or CRN.

If it's successful, return to your default browser and perform a clear cache to refresh the system. However, if the issue persists, try using other supported browsers.

Reach out to me in the comment section below if you have any additional questions or concerns. I'm always here to help. Have a wonderful day!