Set Guestlist API not working. Getting 404 - not found error

I have used POST action in Zapier webhooks - same error.
Custom request + POST action in zapier webhooks - same error and I have tried it in POSTMAN with the same error.

I have the URL as: https://api.gather.town/api/setEmailGuestlist
data pass-through: False
Data: {
“apiKey”: “my API key here”,
“spaceId”: “space ID & name with \ between them”,
“guestlist”: {
“email-address here”: {
“name”: “Emma”,
“affiliation”: “Test”,
“role”: “”
}
},
“overwrite”: true
}

Unflatten: No
Headers: Content-Type with a value of application/json

Does anyone know what’s wrong, or has this working for them please?

Thanks
Emma