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I'm using SharePoint 2013 on Office365.

I've added two users in the Admin Portal, both with identical attributes (except name, email address etc.!)

However, when I go onto my site and try to add them to the Members group, only one of them is available. The first image shows adding the user which I CAN add:

Successfully adding a user

This shows the one that I cannot make appear:

Unsuccessfully adding a user

If I complete the "unsuccessful" adding of the user, then the user receives an email inviting them to the site, but they don't appear in the list of Members:

list of available users

I'm at a loss to understand what I'm doing wrong. The "successful" user Sam Wilson has exactly the same attributes as the "unsuccessful" user, except that SharePoint can find him in the list of users in the SharePoint users portal.

list of Active users

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migrated from May 14 '13 at 15:35

This question came from our site for professional and enthusiast programmers.

This site is for programming question only. – Ondrej Tucny May 14 '13 at 11:44
Ok, sorry. I'll find somewhere else. – Edwardo May 14 '13 at 11:46

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