Hello @Andrej_Kurocenko and welcome to the forums!
I believe you need at least one resource in your App configured to use the environment you require. This linked post summarizes the issue pretty well.
You should:
- Create a single REST API Resource that is configured for the
staging
anddev
environments - In your app, create a new query that uses this newly created Resource (even if it is not yet configured for your specific API)
- Check the environment switching menu and hopefully see that you can select the other environments.