subnetIds

The list of groups that define which subnets and IP ranges the broker can use from different Availability Zones. If you specify more than one subnet, the subnets must be in different Availability Zones. Amazon MQ will not be able to create VPC endpoints for your broker with multiple subnets in the same Availability Zone. A SINGLE_INSTANCE deployment requires one subnet (for example, the default subnet). An ACTIVE_STANDBY_MULTI_AZ Amazon MQ for ActiveMQ deployment requires two subnets. A CLUSTER_MULTI_AZ Amazon MQ for RabbitMQ deployment has no subnet requirements when deployed with public accessibility. Deployment without public accessibility requires at least one subnet.

If you specify subnets in a shared VPC for a RabbitMQ broker, the associated VPC to which the specified subnets belong must be owned by your Amazon Web Services account. Amazon MQ will not be able to create VPC endpoints in VPCs that are not owned by your Amazon Web Services account.