Encountered error on step 7 of Making a Copy of an App w/ Realm CLI

I was following the guide https://www.mongodb.com/docs/atlas/app-services/manage-apps/configure/copy-app/ and got stuck on step 7.

C:\Users\janedoe\myproject>realm-cli push --remote="myproject_development-scxyo"
Determining changes
push failed: resource name can only contain ASCII letters, numbers, and underscores

However, it wasn’t specified which resource is violating the rule “resource name can only contain ASCII letters, numbers, and underscores”, so I’m at a loss on how to get started on fixing the error.

The original app is working fine, though, which confuses me more.