There are no commands defined in the "OAuth2" namespace.

[balvirsingh]

symfony 4.4.8
php 7.3

When I run the command -
php bin/console OAuth2:CreateScope scope read

it gives the following error -
There are no commands defined in the "OAuth2" namespace.

[myspulin]

You have to register all commands as service:

services:

OAuth2\ServerBundle\Command\CreateClientCommand:
    tags:
    - { name: 'console.command', command: 'OAuth2:CreateClient' }

OAuth2\ServerBundle\Command\CreateScopeCommand:
    tags:
    - { name: 'console.command', command: 'OAuth2:CreateScope' }
    
OAuth2\ServerBundle\Command\CreateUserCommand:
    tags:
    - { name: 'console.command', command: 'OAuth2:CreateUser' }