Gettting "The Web Form ID specified is invalid" for adobe sign API

[Cake_in_panic]

Hi!

I am trying to embed a signing widget into my app

I have successfully created widget with `/api/rest/v6/widgets` using `x-api-user` header, got widget id,

but when I am trying to get its code by /api/rest/v6/widgets/${id}/views,

I'm getting error

code: "INVALID_WIDGET_ID"
message: "The Web Form ID specified is invalid"

How can I fix this problem?