How to launch Aviatrix Gateway in AWS using CMK (Customer Managed Key)

Recently we were helping customer to launch Spoke Gateways in their AWS account, after 10 minutes launching the gateway, the gateway creation were reverted and following errors generated

Error: [AVXERR-TRANSIT-0119] Failed to launch gateway test. Instance i-0005da0797da40ae8 could not be started. Delete the gateway test to clean up resources and try again. It is possible that gateway size t3.small is not supported in the region us-east-1 or EBS encryption KMS CMK Key policy Key administrators and users are not updated with your Aviatrix APP role and Aviatrix EC2 role.
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