<p>Maybe you created a cloud account with the same UPN before sync'ing the on premise with azure ad connect? or something else of that nature.</p>
<p>Navigate to graph explorer <a href="https://developer.microsoft.com/en-us/graph/graph-explorer" rel="nofollow noreferrer">https://developer.microsoft.com/en-us/graph/graph-explorer</a> log in with a azure ad admin account and type in a query like this</p>
<p><a href="https://graph.microsoft.com/v1.0/users?$filter=startswith(UserPrincipalName,%27##UPNHavingIssues##%27)" rel="nofollow noreferrer">https://graph.microsoft.com/v1.0/users?$filter=startswith(UserPrincipalName,'##UPNHavingIssues##')</a></p>
<p>There should only be entry, but if there are multiple, then that's where the problem is.</p>

CC BY-SA 4.0
2023-09-01T11:59:54.550Z
Interesting, will test that.
RS Finance
CC BY-SA 4.0
2023-08-31T16:09:54.373Z
2023-08-31T16:09:54.373Z
geeky_girl
<p>I am trying to connect my Azure DevOps environment to Azure Active Directory. I get the following error:</p>
<blockquote>
<p>Tenant switch failed, on a precondition, with the following message: 1
of 10 total users has multiple active identities with the same UPN.
Please either remove the duplicates or change the UPNs to be unique.</p>
</blockquote>
<p>There are only 9 users in Azure DevOps. The only thing I can think of is that a user is removed from the organisation and later readded, but I can't find any duplicates in the Users in DevOps. Also, in the target AAD there are no duplicates (I can't imagine you can have duplicate UPN anyway).</p>
<p>I can't really find anything that can help met troubleshoot this issue. Anyone has any ideas to fix this?</p>

<azure-devops><azure><active-directory>
Your organization X failed to connect to the X Azure Active Directory
RS Finance
# Your organization X failed to connect to the X Azure Active Directory

(Asked by: username_0 on 2023-06-16)

I am trying to connect my Azure DevOps environment to Azure Active Directory. I get the following error:

> Tenant switch failed, on a precondition, with the following message: 1
> of 10 total users has multiple active identities with the same UPN.
> Please either remove the duplicates or change the UPNs to be unique.

There are only 9 users in Azure DevOps. The only thing I can think of is that a user is removed from the organisation and later readded, but I can't find any duplicates in the Users in DevOps. Also, in the target AAD there are no duplicates (I can't imagine you can have duplicate UPN anyway).

I can't really find anything that can help met troubleshoot this issue. Anyone has any ideas to fix this?

**Tags:** azure-devops, azure, active-directory


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## 1 answers

### Answer by username_1 on 2023-08-31. Score: 1

Maybe you created a cloud account with the same UPN before sync'ing the on premise with azure ad connect? or something else of that nature.

Navigate to graph explorer <https://developer.microsoft.com/en-us/graph/graph-explorer> log in with a azure ad admin account and type in a query like this

[https://graph.microsoft.com/v1.0/users?$filter=startswith(UserPrincipalName,'##UPNHavingIssues##')](https://graph.microsoft.com/v1.0/users?$filter=startswith(UserPrincipalName,%27##UPNHavingIssues##%27))

There should only be entry, but if there are multiple, then that's where the problem is.

> **Comments:**
> **username_0**: Interesting, will test that.  

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