Users who have created an Amazon account recently may face a problem of not being able to launch P3 instances. This is due to a limit enforced by Amazon for new users. You will see a message as below.
To get over the problem log a request at the following URL:
Request a “Service Limit Increase”, Limit Type as “EC2 Instances” and choose appropriate Region, P3 Instance Type and number you want to run at one time.
Refer to snapshot below.