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Since you don't have launch_type set, you shouldn't be setting platform_version:
&gt; Platform version on which to run your service. Only applicable for launch_type set to FARGATE. Defaults to LATEST. More information about Fargate platform versions can be found in the AWS ECS User Guide.
<https://www.pulumi.com/registry/packages/aws/api-docs/ecs/service/>

You're running on EC2, which doesn't support this argument.

Assuming you're trying to specify an arm workload, you want to use `runtime_platform` instead of `platform_version`

Related docs:
• <https://www.pulumi.com/registry/packages/awsx/api-docs/ecs/fargateservice/#runtimeplatform_nodejs|https://www.pulumi.com/registry/packages/awsx/api-docs/ecs/fargateservice/#runtimeplatform_nodejs> 
• <https://www.pulumi.com/registry/packages/aws/api-docs/ecs/taskdefinition/#taskdefinitionruntimeplatform|https://www.pulumi.com/registry/packages/aws/api-docs/ecs/taskdefinition/#taskdefinitionruntimeplatform>

<@U04D2DBKUF9> thanks for sharing these doc details, will take a look later.
I decided to simply keep the platform arch to x86_64 for now, which is the default.
Although I think graviton is suppose to be a much more efficient cpu arch.