Unable to fetch tags

[Syrious]

I'm trying to fetch my tags, but this does not work (using an http client)

GET https://app.fizzy.do/ACCOUNT_SLUG/tags
Authorization: Bearer <TOKEN>

When sending the request, I get a 500 Internal Server Error

Other endpoints like posting a card and fetching columns of a board are working. Did the API change but the documentation wasn't updated?