Earlier you created a DNS record to confirm that you own {0}. Now you want to direct all {0} traffic, including email, to ...

Earlier you created a DNS record to confirm that you own {0}. Now you want to direct all {0} traffic, including email, to %BRAND_OFFICE_365_SHORT%, so you can start receiving email here. That means you have to update DNS records at the company where you bought {0}. It's usually the same company where you completed the earlier step, but it may be different.