Just approved but wrong tenant

After getting the final approval notice from Microsoft, I noticed that the login to the nonprofit portal ends with the domain "MyCompany1.onmicrosoft.com" but our existing tenant with all our licenses is "MyCompnay.onmicrosoft.com". In order for our existing tenant "MyCompany.onmicrosoft.com" to be able to purchase nonprofit licenses does a merge or transfer of some kind need to take place?

Thanks for any help!!