Heads Up :
The post you are writing will appear in a public forum. Please ensure all content is appropriate for public consumption. Review the employee guidelines for the community here.
Going from v0 to v1 of the Meraki API, I solved this by changing the name of the "X-Cisco-Meraki-API-Key" variable to "apiKey".Clicking on the collection name, you can see that "X-Cisco-Meraki-API-Key" is now set using the "apiKey" variable.