allow acces to azure website based on securuty group in Azure AD

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VB

ASP

Visual-Studio

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i've built a Web Form with Master Page that authenticates with Azure AD. It works great and all the users in the organiztion can login and access the site.

However, I'd like to restrict all or parts of the site based on the security group they are a member of in AD.

i can't figure out how to do this:

i've tried My.User.IsInRole("group1") but it doesn't work

any suggestions?