When your accountant receives an email about the invitation, you’ll know they accepted your request when the status on the Manage Users page changes from Invited to Active, Info2180.

If your accountant already has a QuickBooks Online Accountant account, once they accept the invitation, they need to sign in to their account. It will direct them to a page where they can select which business or company file they will manage for you. They can also switch client files in their end view. Please see the screenshot below:

If they don’t, they will need to sign up first. Please note that signing up is free and allows them to access all the features available in your version of QuickBooks Online at no cost to you. If your accountant has added the incorrect company file, you can remove and re-invite them to make the necessary corrections. Please refer to this article for detailed steps: Add Accountant users.
You can explore the tools your accountant is using and share with them to enhance their workflow moving forward: Use accountant tools and features.
Feel free to leave a comment if you have any questions or need further assistance with adding your accountant to QuickBooks. We are here to help.