Hi, Today i deleted a user and re-added him in QBO. he is getting the emails of invitation but that link is not working. i tried to change the browser, network and device

I'm here to help you troubleshoot this issue and make sure your new user gets successfully invited to your account, Jawad.

If the user receives multiple invitations, let him click on the latest link, as older ones may not work anymore. 

Also, the user can open the email through a private window or any other supported browsers, as the cache may have caused this behavior. Here are the keyboard shortcuts to save time:

• Google Chrome: Press Ctrl+ Shift + N
• Safari: Press Command + Shift + N
• Mozilla Firefox: Press Ctrl+ Shift + P

If it works fine, return to your default browser and clear the cache to refresh the system. 

If the user encounters the same issue, can you share the specific error message he received? It'll allow me to gather my resources more effectively. You may also contact support to investigate this further.

You may run through the resources from this article for more hints while customizing user roles in QuickBooks: Add and manage users in QuickBooks Online.

If you need an accountant to help with business tasks, invite one through the Manage Users window. 

I suggest returning to this thread if you need more help while adding, managing, or deleting user profiles from your QuickBooks account. I'm more than willing to assist you every step of the way.