I can explain how QuickBooks manages user permissions and help you add a new user to your QBO account, SaraS2.
You'll need to delete the user profile you're editing from your QuickBooks Online account to trigger a new invite, allowing access without needing a new purchase.
Here's how to delete a user:
- Go to the Manage users page.
- From the Action column, select the dropdown arrow beside Edit.
- Choose Delete.

I'm adding this article for a detailed guide on managing users to help you streamline the process: Add and manage users in QuickBooks Online and Intuit Enterprise Suite.
Additionally, check this link for a detailed overview of User roles and access rights in QuickBooks Online and Intuit Enterprise Suite for reference.
If you have any more questions about the process, feel free to reach out.