Endpoint /1/tokens/{YourToken}/webhooks only returns "unauthorized token"

I can post to this to register a webhook (tells me I have one registered for that endpoint and idModel). I cannot GET it to see a list of my webhooks.
(Reference: https://developer.atlassian.com/cloud/trello/rest/#api-tokens-token-webhooks-get)

It looks like key={YourKey} needs to be passed as an argument.

Yes, that is a required query parameter for all routes. I’m working on adding it into the documentation so that it is clearer.