Creating a Master Session

API
,
1

I’ve come back to Alloy after a little time away working on other projects. I need to generate an API key, so I’m trying first to create a master session. But I’m getting the following, even though I can log into the UI with the same credentials. I’m Admin. Has something changed?

{
  "category": "UserForbidden",
  "errorCode": "E1519685975",
  "errorData": {
    "requestTime": 8
  },
  "httpStatusCode": 403,
  "message": "Invalid security details"
}