SharePoint Look Book - Error Adding to Tenant

Hi All,

in regards to https://techcommunity.microsoft.com/t5/Microsoft-SharePoint-Blog/Take-advantage-of-the-SharePoint-Look-Book-sample-designs-in/ba-p/465919

Have any of you guys successfully added the templates to the tenant environment. Had been trying using the global admin account but it keep giving me error stating as below.

Will appreciate all help! thanks in adavnce