bin/magento module:uninstall Barbanet_SampleModule

You are about to remove code and/or database tables. Are you sure?[y/N]y

Enabling maintenance mode

You are about to remove a module(s) that might have database data. Do you want to remove the data from database?[y/N]y

You are removing data without a database backup.
Removing data of Barbanet_SampleModule
Removing Barbanet_SampleModule from module registry in database
Removing Barbanet_SampleModule from module list in deployment configuration
Removing code from Magento codebase:

Command "remove" failed: Loading composer repositories with package information
    Authentication required (repo.magento.com):
      Username:       Password:



  [ComposerDownloaderTransportException]
  Invalid credentials for 'https://repo.magento.com/packages.json', aborting.



remove [--dev] [--no-progress] [--no-update] [--update-no-dev] [--update-with-dependencies] [--ignore-platform-reqs] [packages1] ... [packagesN]



Please disable maintenance mode after you resolved above issues