Microsoft.SharePoint.Client.ServerUnauthorizedAccessException. Access Denied, You do not have permission to perform this action or access this resource

This SharePoint tutorial explains how to resolve issue Microsoft.SharePoint.Client.ServerUnauthorizedAccessException. Access Denied, You do not have permission to perform this action or access this resource.

The error comes in while creating a term store using PnP CSOM in SharePoint Online Office 365. The error looks like below:

I wrote the below code to create groups, term sets, terms etc using SharePoint CSOM using PnP SharePoint Office 365.

if (termStore != null)
{					
// Create group, termset, and terms.			
//TermStore store = taxonomySession.GetDefaultKeywordsTermStore();

TermGroup myGroup = termStore.CreateGroup("TSInfo Group", Guid.NewGuid());
TermSet myTermSet = myGroup.CreateTermSet("Brand", Guid.NewGuid(), 1033);
myTermSet.CreateTerm("TV", 1033, Guid.NewGuid());
myTermSet.CreateTerm("Camera", 1033, Guid.NewGuid());
myTermSet.CreateTerm("Fridge", 1033, Guid.NewGuid());
myTermSet.CreateTerm("Washing Machine", 1033, Guid.NewGuid());
cc.ExecuteQuery();																			
} 

Microsoft.SharePoint.Client.ServerUnauthorizedAccessException. Access Denied, You do not have permission to perform this action or access this resource

I am a global administrator in Office 365 tenant. But still, the error was coming.

For this, you need to be a member of “Term Store Administrators”.

Open SharePoint Online Admin site and click on Term Store from left navigation. The URL looks like: https://-admin.sharepoint.com/_layouts/15/termstoremanager.aspx

There you will see Term Store Administrator, add the user name here.

Now if you will run the code the error “Microsoft.SharePoint.Client.ServerUnauthorizedAccessException. Access Denied, You do not have permission to perform this action or access this resource” will not come and you can able to create groups, term sets or terms.

Note: Even if you are a global administrator, you can add terms unless you are in Term Store Administrator group.

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I hope this SharePoint Online tutorial helps to resolve error Microsoft.SharePoint.Client.ServerUnauthorizedAccessException. Access Denied, You do not have permission to perform this action or access this resource.