Reporting on multiple tenants with the Microsoft Graph

The aim of this project has been to show you how to manage multiple Microsoft 365 tenants quickly, easily and securely using the Microsoft Graph. this article builds on a previous article so go and take a look at:

Using the Microsoft Graph with multiple tenants

The complete steps in this whole process are:

1. Embed a ‘static’ Azure AD application in all the tenants you wish to access.

2. Give those ‘static’ Azure AD applications, in all those tenants, the appropriate permissions to access the tenant values.

3. Run a Graph request against these Azure AD applications in each tenant and extract the desired results.

This article will show you how to complete Steps 2 and 3. Step 1 was covered in the previous article.

Step 2 requires granting appropriate permissions to the Azure AD application already in place inside each tenant. The manual process of how to achieve this is covered in my article:

Using interactive PowerShell to access the Microsoft Graph

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However, why do it manually if you can automate it I say? With that in mind, I have created a self executing PowerShell script to add the appropriate permissions to multiple tenants and allow the reading of OneDrive for Business usage information for all users. You’ll find the program to do this in my GitHub repo here:

https://github.com/directorcia/Office365/blob/master/graph-adapp-per-add.exe

You’ll need to download the file into the location where all the XML configuration files are that were created in Step 1. These will be needed again as the program cycles through all those tenants adding the appropriate permissions.

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When you run the program, it will read the XML configuration files it finds in the directory and then ask you to login to each tenant again. You need to do this as you are granting/consenting to permissions and that requires administrator access.

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You’ll need to complete the process of opening a browser session to each tenant and Accept the permissions as shown above. You’ll note that, in this case, they are read only permissions.

For more details on this process if you haven’t seen it, take a look at the article I wrote about doing the same thing for a single tenant:

Making PowerShell automation easier with the Microsoft Graph

Remember, that you don’t necessarily have to open the default browser all the time as the consent URL is always copied to the clipboard, so you could just past it into existing active sessions for that tenant if you wished.

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The program will work through all the domains available.

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If you want to see what’s happened visit the Azure portal for each tenant. Navigate to Azure Active Directory, then App Registrations, All Applications. Select the name of the Azure AD application you are using, then  API permissions as shown above. You should see that the only permission it has is Read All usage reports. You should not that consent has also been granted.

That now completes Step 2 of the process.

We now have an Azure AD application in all the desired tenants and that Azure AD application has the appropriate permissions to do things. We can now start extracting information by continuing to  Step 3.

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In this example, we’ll run a program that will retrieve usage information about OneDrive for Business for each user in each tenant, without prompting for a login!

You’ll need to download the program I’ve written to do this (graph-odfb-get.exe), which you’ll find here:

https://github.com/directorcia/Office365/blob/master/graph-odfb-get.exe

Again, you need to place it the same directory where all the tenant configuration files are, as shown above, so it can access all the tenants configured in previous steps.

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When you run the program, you’ll see the program loop through all the domains and all the users in those domains, without asking for a login.

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At the end of each domain you’ll see a summary of OneDrive for Business for that domain as shown above.

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At the end of the process you’ll see an aggregate summary for all your domains, as shown above.

This may seem like a lot of work but remember, you only need to do Steps 1 and 2 ONCE! Once the Azure AD application is configured for each tenant and the Graph has the appropriate permissions you can run Step 3 as MANY TIMES as you wish, securely, WITHOUT be prompted for a login to each tenant! How easy is that to automate?

This example has used just one aspect of the Graph being OneDrive for Business. You can use the Graph to do just about anything in Microsoft 365 you need to, including actually changing and update parameters!. In fact that is what I’m off to do right now.

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