Unknown Error https://keys.developer.keap.com/docs/keap-150k/1/routes/tags/get

I’m using keap-150k but can’t get response
Unknown Error occured
Please advice

Does it works?

How did you get to that page? That is the internal Apigee portal docs which we hide from the menus. Our full developer docs are here https://developer.infusionsoft.com/docs/rest