I use the people picker to select the user that I want to add on intranet (SharePoint Online). I can find the user using People Picker, however, as soon as I click share button to add user in a SharePoint visitors group I get the following message:

An error has occurred in pop up as "The user does not exist or is not unique"

  • Have you tried the solutions mentioned?Is there any update? – Elsie Lu_MSFT Apr 12 at 7:36

Solution: This issue could be for many reasons like space in user principal, or user is disabled

please check below solution to solve the problem.

Solution 1: Ensure that there is no space. The most common issue that occurs with the above is inadvertently adding a space character between the elements of the path.

Solution 2: Ensure that the user account is not in a Disabled state in AD.

  • Thank you for your quick response! I will check it. – Rupa 91 Apr 7 at 18:10
  • Please mark as answer if you are satisfied it will help others – Rajat Sahani Apr 8 at 5:35

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