On my project I've come to realize I have to rename some site collections. example: mytenant.sharepoint.com/sites/collectionName to mytenant.sharepoint.com/sites/OtherName
So in the admin center I renamed my url from collectionName to OtherName. however /sites/collectionName is still forwarding traffic to /OtherName.
What can I do to make the /sites/collectionName url available for a new site collection ?