Packer issue with setting image version EoL

The below command is not setting a value for attribute: shared_gallery_image_version_end_of_life_date

The echo statement prints the value but when the image version is published, there is no expiry date.

#!/bin/bash
expiry_date=$(date -d “+3 months” --utc +“%Y-%m-%dT%H:%M:%SZ”)
echo “Expiry Date: $expiry_date”
PACKER_LOG=1 packer build -var “azure_client_id=" -var "azure_client_secret=” -var “azure_subscription_id=" -var “git_token=” -var “gallery_name=goldenimage_gallery” -var "resource_group=********" -var "subscription=” -var “image_name=az-img-rhel8-gen1” -var “vm_size=Standard_D2_v4” -var “image_version=1.0.0” -var “virtual_network_name=HUB-USEast” -var “virtual_network_resource_group_name=RG-EastUS” -var “virtual_network_subnet_name=Internal-App” -var “image_sku=8-LVM” -var “shared_gallery_image_version_end_of_life_date=$expiry_date” ./RHEL8/RHEL8.json