Exception during server scale up

I keep running into this problem when I try adding a web server to my current stack on AWS:

Exception during server scale up: An exception occurred in your cloud during server creation: No key pairs found

I presume it’s referring to the AWS Access Keys. I have checked that they are valid and can even see them being used in AWS Security Credentials and IAM Management Console. I have tried both root and IAM key pairs (Administrator), all regions enabled.

Help?

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