Hi People! For what it's worth for_each was also tried but no luck. The way I managed to get this resoucre working was by using a single resource (It doesnt seem multiple resources can be used for the "meraki_switch_stp" resource) And unfortunately I had to remove the programmability of the resource and simply point to either a S/N or stack ID per device/stack. This meant that this resource couldnt reside in the module as different sites had diferent setups. Therefore a seperate folder was created per site for "global variables" which was ran seperately from the bulk/main configuration. See below: resource "meraki_switch_stp" "combined_stp_configuration" {   network_id   = jsondecode(data.aws_secretsmanager_secret_version.meraki_network_id.secret_string)[var.meraki_network_id]   rstp_enabled = true   stp_bridge_priority = [     # Core stack priority     {       stp_priority = var.core_stp_priority       stacks       = [jsondecode(data.aws_secretsmanager_secret_version.stack_ids.secret_string)[var.core_stack_id]]     },     # Access stack priority     {       stp_priority = var.access_stp_priority       stacks       = [jsondecode(data.aws_secretsmanager_secret_version.stack_ids.secret_string)[var.access_stack_id]]     },     # External switch 1 priority     {       stp_priority = var.ext_stp_priority_1       switches = [         jsondecode(data.aws_secretsmanager_secret_version.meraki_switch_serials.secret_string)[var.external_switch1_serial]       ]     },     # External switch 2 priority     {       stp_priority = var.ext_stp_priority_2       switches = [         jsondecode(data.aws_secretsmanager_secret_version.meraki_switch_serials.secret_string)[var.external_switch2_serial]       ]     }   ] } Archie ... View more