Hello, I am in the process of implementing being able to set a default track from snapcraft, while testing against staging I ran into the following: ubuntu@snapcraft-dev:~/snapcraft$ snapcraft tracks candycane Name Status Creation-Date Version-Pattern latest active - - candybar default 2019-10-17T14:11:59Z - x active 2020-08-21T20:30:00Z x\..* ubuntu@snapcraft-dev:~/snapcraft$ snapcraft set-default-track candycane x Default track for 'candycane' set to 'x'. ubuntu@snapcraft-dev:~/snapcraft$ snapcraft set-default-track candycane foo Received 400: 'Select a valid choice. The given value is not one of the available choices.' ubuntu@snapcraft-dev:~/snapcraft$ snapcraft set-default-track candycane latest Received 400: 'Select a valid choice. The given value is not one of the available choices.' Describing, - setting to a valid user created (on behalf of the Snap Store admin) track works just as expected - setting to a non existent track returns a 400, this is not documented on https://dashboard.snapcraft.io/docs/api/snap.html#managing-snap-metadata and I wonder if this should be a 404. It also returns a strange message - trying to set to latest returns a 400 as well. The latest agreement is that this operation should be possible. The important bit is to know what the actual error code to commit to is to correctly capture and return a nicer Snapcraft message to the user. Thanks