Thank you for using AWS SageMaker.
With the details provided, I see the parameters provided to the Endpoint Configuration are valid. To better understand the issue, I did try creating serverless endpoint under my account and I purposely created under a region where the Serverless endpoint is not supported i.e under us-west-2 and encountered same error as your, but same configuration worked under us-east-1 as it is supported. I'd recommend you to visit AWS documentation for [Serverless Inference] (https://docs.aws.amazon.com/sagemaker/latest/dg/serverless-endpoints.html), to verify if you are creating the Serverless Endpoint in supported region.
If the region is supported and you still face the issue, I'd recommend you to reach out to AWS Support for further investigation of the issue:
Open a support case with AWS using the link: https://console.aws.amazon.com/support/home?#/case/create
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