Merge pull request #14097 from aws-amplify/V1664968988

fix: load region from AWS client if the credentials are managed by AWS-SDK

Author: Amplifiyer

packages/amplify-provider-awscloudformation/src/iterative-deployment/deployment-manager.ts

@@ -88,8 +88,9 @@ export class DeploymentManager {
   ): Promise<DeploymentManager> => {
     try {
       const cred = await loadConfiguration(context);
-      assert(cred.region);
-      return new DeploymentManager(cred, cred.region, deploymentBucket, eventMap, options);
+      // this is the "general" config level case, aws sdk will resolve creds and region from env variables etc.
+      const region = cred?.region ?? new aws.S3().config.region;
+      return new DeploymentManager(cred, region, deploymentBucket, eventMap, options);
     } catch (e) {
       throw new AmplifyError(
         'DeploymentError',