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To access user information list, add /_layouts/15/people.aspx?MembershipGroupId=0 at the end of the site URL:
[https://site%20/_layouts/15/people.aspx?MembershipGroupId=0]https://site /_layouts/15/people.aspx?MembershipGroupId=0 , you can get the ID of the user:
The you can get user information by using the following rest api:
https://site/_api/Web/GetUserById(ID)
Note: highlight is parameter.
Hope these information helps.
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