Asana Create Webhook Api throws "DNS: The webhooks target hostname is invalid"

hi Team,

We are using Asana Webhooks to listen for task events.When trying to establish a webhook we are receiving the following error

DNS: The webhooks target hostname is invalid.

Our target URL is configured to a Webapi hosted in the cloud with basic authentication and API key support.

Since Asana does not support secured webapis we have passed the authentication information in URL to asana and it seemed to work fine earlier.
But recently we are not able to create new webhooks or listen to events from existing webhooks.
Sample Payload for Webhook Creation via API Key
{“data”:{“resource”:“1200373155493816”,“target”:“https://:apikey@hostname”}}
Sample Payload for Webhook Creation via Basic auth
{“data”:{“resource”:“1200373155493816”,“target”:“https://username:password@vuram.com:swatdev.vuram.com”}}

Please help us configuring a webhook target api with basic authentication as target uri