You must use a valid fully-formed launch template. The t2.small instance type does not support an AMI with a UEFI boot mode. Only instance types built on the Nitro System support UEFI. Specify an instance type that supports UEFI.
This is so weird. Would ECS require UEFI?
You are not logged in. Log in to post an answer.
A good answer clearly answers the question and provides constructive feedback and encourages professional growth in the question asker.