Hi there, 

Javay here - from Calendly’s Developer Support team. Thanks for reaching out — great question, and you're definitely not alone in running into this error.

The message you're seeing:

"parameter": "event_type", "message": "Not enough team members for this event type."

usually means that your team event type (like a Round Robin or Collective event) doesn’t currently have enough active team members assigned or available for Calendly to return any available times.

Here are some things to double-check:

• Assigned Team Members: Make sure your event type has the right number of users assigned as hosts. For Collective events, all members need to be assigned and available. For Round Robin, at least one is required.

• User Status: Confirm that the assigned users are active Calendly users (not pending or removed), and have connected calendars.

• Availability: Check each assigned team member’s working hours and make sure they don’t have calendar conflicts or OOO events blocking availability.

• Calendar Connections: Sometimes users appear assigned but haven’t properly connected their calendars, which can prevent availability from showing.

Once you've verified all the above, try testing again with a short time window (like 1–2 days out) and make sure you're using the correct event type UUID and time zone parameters.

If you’ve already verified all of that and the issue continues, I’d recommend contacting support@calendly.com with the event type UUID and details of the assigned members.

I hope this helps!