Unable to get the policydefinition ids from an Object

[cutekoti]

The following is the Policy Definition file
`targetScope = 'managementGroup'
param pattern string
param policyName string
param policyType string
param initiativeName string
param assignmentName string

@Allowed([
'Deny'
'Audit'
'Disabled'
])
@description('The effect determines what happens when the policy rule is evaluated to match')
param effect string = 'Deny'
param policySource string = 'Azure Naming Convention'
@Allowed([
'Default'
'DoNotEnforce'
])
@description('When enforcement mode is disabled, the policy effect isn't enforced (i.e. deny policy won't deny resources). Compliance assessment results are still available.')
param enforcementMode string = 'Default'

output oPolicyId string = namingConventionDefinition.id
output oPolicyName string = namingConventionDefinition.name
output oPolicyInitiativeId string = namingConventionInitiative.id

resource namingConventionDefinition 'Microsoft.Authorization/policyDefinitions@2021-06-01' = {
name: policyName
properties: {
displayName: policyName
policyType: 'Custom'
mode: 'All'
description: 'Policy to Check the naming convention of the target Azure Resource.'
metadata: {
category: 'Custom'
source: policySource
version: '0.1.0'
}
policyRule: {
if: {
allOf: [
{
field: 'type'
equals: policyType
}
{
field: 'name'
notLike: pattern
}
]
}
then: {
effect: effect
}
}
}
}`

The Initiative file is as follows.I am using initiative resource in to a module in the main.bicep file.

`targetScope = 'managementGroup'
param policySource string = 'Azure Naming Convention'
param initiativeName string = 'Initiative1'
param policyDefinitionIds array

output initiativeId string = initiative.id

resource initiative 'Microsoft.Authorization/policySetDefinitions@2021-06-01' = {
name: initiativeName
properties: {
policyType: 'Custom'
displayName: initiativeName
description: '

{policySource}'
metadata: {
category: 'Custom'
source: policySource
version: '0.1.0'
}
policyDefinitions: policyDefinitionIds
}
}`

I am calling the above policy Definition module in the main policy implementation files as follows.

`targetScope = 'managementGroup'
param initiativeName string = 'initiative-naming-conv'
param assignmentName string = 'asgmt-naming-conv'

param policies array = [
{
name: 'plcy-naming-conv-rg'
pattern:'rg-'
policyType: 'microsoft.resources/subscriptions/resourceGroups'
}
{
name: 'plcy-naming-conv-vm'
pattern:'vm'
policyType: 'Microsoft.Compute/virtualMachines'
}
]

module namingConventionDefinitions './definitions/generic.bicep' = [for policy in policies: {
name: policy.name
params: {
policyName: policy.name
pattern: policy.pattern
policyType: policy.policyType
initiativeName:initiativeName
assignmentName: assignmentName
}
}]

module initiatives './initiatives/generic.bicep' = [for (policy, i) in array(policies): {
name: initiativeName
params: {
initiativeName: initiativeName
policyDefinitionIds: array(namingconventionDefinitions[i].outputs.policyId)
}
}]`

I am unable to get the array of policy ids from the Policy Definitions module. Any help regarding this is much appreciated.