Error Message

Lambda was unable to configure your environment variables because the environment variables you have provided contains reserved keys that are currently not supported for modification. Reserved keys used in this request: AWS_REGION, AWS_ACCESS_KEY

Problem

Lambda functions come with a set of default environment variables. These environment variable names are reserved, and users will not be able to overwrite them.

According to the above error message, you are trying to assign values to the reserved AWS_REGION and AWS_ACCESS_KEY variable in your serverless.yml.

Solution

Rename the environment variable in your serverless.yml.

Here is a list of all reserved environment variable names.