Following these steps will allow your environment to be provisioned on time:

Step 1 - Perform initial log in following the instructions provided in the provisioning e-mail within 30 days of receipt. Use Initial User to Maintain Basic Configuration.
Step 2 – Once you have logged in for the first time, create an administrator role before performing other tasks. Request System Subscription from the Service Control Center.
Step 3 - Discuss with your implementation partner or team the appropriate time to provision the follow-up system.
By default, you are entitled to one test tenant and one production tenant, unless otherwise stated in your contract. The test tenant is provisioned by SAP after the contract start date.