Create Security Groups in AAD:Go to the Azure Portal.Navigate to Azure Active Directory > Groups.Create a new security group for each brand and add the respective administrators to the group.Assign Security Groups in Site Builder:In the Commerce Site Builder, select the site for the brand.Go to Site Settings > Staff.Add the security group for the brand to the site. This will restrict access to the site to members of the security group.Verify Access Control:Ensure that administrators can only access their designated brand's site and cannot see or manage other brands' sites.

Example:

Create Security Groups:

Brand A: BrandA_Admins

Brand B: BrandB_Admins

Brand C: BrandC_AdminsAssign Security Groups to Sites:

For Brand A's site, assign the BrandA_Admins group.

For Brand B's site, assign the BrandB_Admins group.

For Brand C's site, assign the BrandC_Admins group.Configure Site Settings:

In Site Builder, go to Site Settings > Staff for Brand A's site.

Add BrandA_Admins to the site.

Repeat for Brand B and Brand C with their respective security groups.