Besides tenant members, it is also possible to use Graph Explorer signed in as a tenant’s guest user.

In Graph Explorer, add “?tenant=”{}” to the URL in the address bar (eg, and press enter. This will explicitly make Graph Explorer to consider only that tenant when signing in.

Now sign into Graph Explorer as usual, with a guest user’s credentials. Afterwards, try making this GET request: “”. In the response, the user’s “userPrincipalName” value should contain “EXT”, meaning the user currently signed in is a guest user in the tenant.

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