Sparrowtech

Julian Sperling's Personal Blog

Troubleshooting Entra ID Tenant Switching Issues
Troubleshooting Entra ID Tenant Switching Issues

So – you have started testing “Require authentication strength”, as requested by Microsoft. But have you been receiving issue reports from partner organizations or guests who cannot switch to your tenant? Or maybe you are a Teams administrator that has been seeing reports that your users cannot Collaborate with a specific Organisation? From the other... » read more

Blocking M365 Data exfiltration: Conditional Access
Blocking M365 Data exfiltration: Conditional Access

From time to time, customers have the Ask to allow access to Microsoft 365 on devices not managed by their Organisation. Whether it is because of a bring-your-own-device (BYOD) strategy, the desire to access work files on the go, collaborating with guests, or a multitude of other reasons. Specifically for VDI: Allow use of the... » read more

Microsoft Build Notes With AI
Microsoft Build Notes With AI

There is no better indicator of how important AI has become to Microsoft than the frequency with which "Copilot" and "AI" are mentioned in the Book of News. And to be honest, it was so noticeable that I got interested in the trendline – the two other keywords are of course completely random 😉: Approach:... » read more

My AI-Free Notes for the “Microsoft Build” Event
My AI-Free Notes for the “Microsoft Build” Event

The Microsoft Build event is one of the most important events for developers and IT professionals worldwide. Each year, new innovations and technologies from the Microsoft ecosystem are presented. Although the focus is on developers, in the Microsoft Cloud world, practically all areas now seamlessly merge. Therefore, it is wrong to expect topics exclusively relevant... » read more

All Roads to Entra ID SSO
All Roads to Entra ID SSO

When I started learning Entra ID (then still Azure AD), my biggest challenge — aside from the seemingly endless products renamings in M365/Azure — was that "SSO" (= Single Sign-On) has almost become a buzzword. If you are currently looking for ways to standardize ldentities and less frequently interrupt a users work for logins, you... » read more

Going Loopy rotating Entra ID App Certificates with PowerShell
Going Loopy rotating Entra ID App Certificates with PowerShell

While working on my appeal against Application.ReadWrite.All, I stumbled upon a potential way to rotate an application’s authentication certificate without Graph API permissions. After some experimentation, I was unable to get it running in PowerShell, so I set it aside for the time being to finish the article. However, the topic continued to intrigue me,... » read more

You (probably) don’t need Application.ReadWrite.All
You (probably) don’t need Application.ReadWrite.All

When Microsoft first disclosed the January Midnight Blizzard attack and posted their subsequent deeper analysis I followed the resulting content with great interest – risks posed by Enterprise Applications are a topic near and dear to me. I will try to keep this article standalone, but it might be a good idea to skim the... » read more

Connect-MgGraph with Username and Password
Connect-MgGraph with Username and Password

In my work on the practical implementation of Password Rotation without Privileged Authentication Administrator, I stumbled upon a somewhat extensive challenge. When trying to use PowerShell to sign in to the Graph API using username + password, I couldn’t find a combination in the PowerShell SDK. The only method would be ClientID + Secret –... » read more

(Pass) Keys to a Passwordless Future
(Pass) Keys to a Passwordless Future

Shouldn’t there be huge demand for an alternative to passwords? The frequency of phishing attacks is constantly increasing, and even bypassing multi-factor authentication is becoming more common (Evilginx says hello). Maintaining and using password managers is also not a pleasant task – so why do we, as the first security measure, use our fingers to... » read more

Theatre Against Overprivilege: PAM Edition – Theory
Theatre Against Overprivilege: PAM Edition – Theory

Raising the Curtain There are some things that regularly bother me – for example, I often wonder how all the Entra ID API rights demanded by applications are justified. I have spent quite some time with the Privileged Access Management piece – but let’s not get ahead of ourselves, first let’s get to know our... » read more