Note: this is not a duplicate of Localstack throws The security token included in the request is invalid. I've already studied that question and it doesn't quite apply to my situation.
I have an AWS Serverless (SAM) Lambda-based application written in C# on .NET 6 in Visual Studio, utilizing the AWS Power tools. The solution includes CDK code as well.
I've pulled a Docker image of Localstack and installed the aws-cdk-local package. I've also edited the aws credentials file as follows:
[localstack]
aws_access_key_id=local
aws_secret_access_key=local
ignore_configured_endpoint_urls=false
toolkit_artifact_guid=3febc08a-8734-42f5-b259-19f79c2d0136
region=us-east-1
In Visual Studio's AWS Explorer, when I select the [localstack] profile, I see this error:
Unable to connect to AWS: The security token included in this request is invalid.
Even if I click Edit Account and enter the Access Key ID and Secret Access Key exactly as specified in my credentials file...
...it still gives the same error after I click Retry.
Any suggestions?