Not all AZs support all instance types - Availability Zone IDs to exclude.

[magenx]

I just tried setting this up to use us-east-1 and found that the availability zone use1-az3 (which includes us-east-1e) was selected for setting up the subnet and subsequent messagequeue "mq.m5.large" was unavailable.

https://wolfman.dev/posts/exclude-use1-az3/

 data "aws_availability_zones" "azs" {
   state            = "available"
+  exclude_zone_ids = ["use1-az3"]
 }

Originally posted by @youanden in https://github.com/magenx/Magento-2-aws-cluster-terraform/discussions/15