First thing most clients do is go for a CRM trial. Then when you buy the subscription here are the ways to apply
if you are using the Promo code option. As the official documentation doesn’t exist for this, I am sharing the steps:
Step 1: Go to office.com/setup365 and sign in using your trial 365 Global office 365 admin user account:
Step 2: Enter the Promo code (25 characters long) after signing in:
Step 3: Enter the service usage address:
Step 4: Confirm the subscription:
Step 5: Check the licenses to be assigned:
Hope it helps and Happy CRMing!