Adding Distribution List in Alert Notification Service in BTP

We are working on Alert Notification service in BTP for sending alerts for failed IFlows in CPI ( By using the standard IFlow) . We are able to add a single user's email ID in DNS but unable to add multiple email ID's. We tried giving the DL but we dont get the token from SAP.

Can you please help if you have worked on Alert Notification Service and added a DL or multiple email ID's for sending Alert Notification