Michael Liendo it seems like the URL in my first comment got removed, so it was probably not 100% clear what I meant.
The AWS documentation for clients accessing GraphQL from the backend (like Lambdas) says:
To connect to your AWS AppSync GraphQL endpoints from your backend applications (such as AWS Lambda function or Amazon EC2 instances), we recommend using an HTTP client and signing your requests using IAM by following the Authorization and authentication guide.
For more information on working with GraphQL in the backend, see GraphQL from NodeJS.
Then it links to the Amplify documentation about Signing a request from Lambda
I had some issues accessing my GraphQL API via HTTP and IAM and was wondering if there are other ways to access it from Lambda, for example the official AWS.AppSync SDK?