Comment 17 for bug 1999640

The cases were I can't find a problem, the db does have a platform in the charm-origin for local charms. So this is different.

Is the model running 2.9.42 also?

Do you know if this was a long running model starting before 2.9? If so, do you know if it was migrated to a 2.9 controller? Or just upgraded?

You should be able to update the application charm-origin in the db as a workaround. Though that does will not help fixing it.

Provided the machine running turnip-api is on an AMD platform, updating the charm-origin's platform to:
                "platform" : {
                        "architecture" : "amd64",
                        "series" : "bionic",
                        "os" : "ubuntu"
                }

should work.