Graph API - Communication/presence Subscription consistently not receiving changes

Question

We're using the preview subscription API to subscribe to teams user presence changes. Our current flow is the following:

• A user accesses our app
• We delete any existing subscription (as you can only have one at a time)
• We create a new subscription with the new user ID added to the ids filter const data = {
  changeType: 'updated',
  resource: /communications/presences?$filter=id in (${userIds.join(',')}),
  notificationUrl: config.MS_WEBHOOK_NOTIFICATION_URL,
  expirationDateTime: subExpiry,
  clientState: config.MS_WEBHOOK_SECRET
  };

The initial presence works correctly when we get the individual presence, however 80% of the time, changes to any of these user's presences does not call our callback endpoint URL. Note. this payload is accepted correctly with a 200, and get subscriptions returns us the correct sub with correct user IDs. The subscription works around 10/20% of the time.

Any ideas?