Why can't my accountant access my accounts when he in fact received the invitation email from QB and acted upon it. What do I need to do?

Hello there, @userjacob-abboud.

I'm here to help your accountant access your company using his credentials in QuickBooks Online.

To do this, I'd like to know if your accountant received an error message. If there's none, you can let your accountant use an incognito window, clear the cache, or use an alternative browser to access QuickBooks. This is done to avoid saving data that may cause this issue. Or you can re-invite him again using another email account.

Here's how:

1. Go to the Settings and select Manage users.
2. Click the Accounting Firm tab and locate the accountant.
3. Under the Action column, click on the drop-down button, and choose Delete.

Once you have the new email from your accountant, you can invite him again, follow Steps 1 and 2 above. Then, enter the email address in the text box, select the Invite button. This is how it looks like:

I've also added a reference for this topic, in case you want to know more about the process: Invite an accountant to review your accounting in QuickBooks Online.

You may consider checking this article for future reference if you want what are the users doing in your QuickBooks Online: Use the audit log in QuickBooks Online.

You can always tag my name in the comment section if you have other questions. It will be my pleasure to help you further. Take care always.