No Fargate configuration exists for given values

legal_fargate_configurations.md

Starting from CPU

1024 = 1 vCPU 1024 = 1 GB

cpu	legal memory settings
256	512, 1024, 2048
512	1024, 2048, 3072, 4096
1024	2048, 3072, 4096, 5120, 6144, 7168, 8192
2048	4096 - 16384 (any multiple of 1024)
4096	8192 - 30720 (any multiple of 1024)

Starting from memory

1024 = 1 GB 1024 = 1 vCPU

memory	legal cpu settings
512	256
1024	256, 512
2048	256, 512, 1024
3072	512, 1024
4096	512, 1024, 2048
5120	1024, 2048
6144	1024, 2048
7168	1024, 2048
8192	1024, 2048, 4096
9216 - 16384 increments of 1024	2048, 4096
17408 - 30720 increments of 1024	4096

Read more

Deploying FARGATE services using CloudFormation - The guide I wish I had