How do i create a tag on an Uptime Check

I have tried creating a new check or modifying an existing check to add a tag. However when i open the check again, there is no tag.

I also tried to use the Pingdom API to modify a check, and that seemed to indicate i need to preregister the tag, but cannot find anything about this in the documentation:

% curl -X PUT 'https://api.pingdom.com/api/3.1/checks/<check_id>' -H 'Authorization:Bearer <token>' -H 'content-type: application/json' -d '{"tags": ["staging"]}'

{"error":{"statuscode":428,"statusdesc":"Precondition Required","errormessage":"Unknown user tag \"staging\". Create it first to connect it to a check."}}

(I also tried to submit this using "Submit a case", but funnily enough that is broken)

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