Update addpermgroup.md

Author: PowershellScripts

articles/en/SharePointOnline/addpermgroup.md

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-Add SharePoint site permissions to a group using PnP
-Using the PnP PowerShell module, you can assign permissions to an existing group within the Microsoft 365 environment. Keep in mind that claims can make it a bit complex. For a detailed explanation, have a look at the Claims Deep Dive article.
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+# Introduction
+Using the PnP PowerShell module, you can assign permissions to an existing group within the Microsoft 365 environment. It can be a SharePoint group, security group or Microsoft 365 group. Keep in mind that claims can make it a bit complex. For a detailed explanation, have a look at the Claims Deep Dive article.
 
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