How to fix AADSTS50011: Reply address did not match because of case sensitivity.

AADSTS50011: The reply address ... does not match the reply addresses configured for the application.

So, you got an error with a code AADSTS50011? It’s just Azure AD’s authentication acting up because of invalid reply address! here’s a bunch of different reasons that lead to this error. This post describes the variant where the URL’s case sensitivity differns from what’s configured. For me, the most typical scenario where I run into this error is accessing the app from SharePoint.

Problem

So, you’re getting an error somewhat like this:

AADSTS50011: The reply address <...> does not match the reply addresses configured for the application: '<guid>'. More details: Reply address did not match because of case sensitivity.

This is another variation of the good old “AADSTS50011: The reply address does not match the reply addresses configured“-error.

I recently encountered this new version of the error. Normally, you don’t get any extra details – the “More details:” -section will just say “not available” or some such. But I guess a lot of people have been struggling with the case-sensitivity of the URLs (I wonder who thought that was a good idea?), and Microsoft has opted to provide this, slightly improved version of the classical reply-url error.

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How to fix AADSTS50011: The reply address does not match the reply addresses configured… error

AADSTS50011: The reply address ... does not match the reply addresses configured for the application.

So, you got an error with a code AADSTS50011? That’s ok – it’s just Azure AD’s authentication acting up because of invalid reply URLs! Since there might be a couple of different reasons for this error, this post also describes a couple of different solutions, that might help you overcome the issues.

Error

So, you’re getting an error somewhat like this:

AADSTS50011: The reply address ... does not match the reply addresses configured for the application.

AADSTS50011: The reply address … does not match the reply addresses configured for the application.

But why? Did you mess something up? Well, if you’re the person who configured the app you’re trying to use, you probably did! Although Microsoft might still be the one to blame for that. Continue reading