Unable to acces the newly created Public CDN inside our SharePoint online tenant

I am working on SharePoint online tenant, and i want to deploy the sp-dev-fx-webparts found on this link https://github.com/SharePoint/sp-dev-fx-webparts/tree/master/samples/react-script-editor

and to be able to deploy it i need to create a public CDN, so i followed the steps found on this link, but instead of creating a sub-folder, i created a new document library (named CDN) inside our root site, as follow:-

https://www.c-sharpcorner.com/blogs/how-to-enable-office-365-public-cdn-in-your-tenant

Here are the scripts i used:-

>> Connect-SPOService -Url https://ourName-admin.share>> Set-SPOTenantCdnEnabled -CdnType Public>> Add-SPOTenantCdnOrigin -CdnType Public -OriginUrl https://ourName.sharepoint.com/CDN/
>> Add-SPOTenantCdnOrigin -CdnType Public -OriginUrl CDN
>> Get-SPOTenantCdnOrigins -CdnType Public

but i am unable to access the newly created CDN, i tried typing the following URL:-

https://publiccdn.sharepointonline.com/ourName/CDN/

i will get "invalid URL"..

so can anyone adivce on this, why i am unable to access the Public CDN which i created?

Thanks