Laravel 5.5 - Load migrations from nested packages - laravel

Question

I'm working currently on some Laravel packages and have a question about integrating nested packages.
I've packages for Tagging & Roles and would like to integrate them into another Blogging Packages.
But I'm not able to load the migrations from the nested (Tagging & Roles) packages.
I'm currently trying to load the Service Provider of the packages within the BlogServiceProvider (register function). But alway get an error when I try to do an composer update or dump-autoload
$this->app->register(
'OName\Taggy\TaggyServiceProvider'
);
$this->app->register(
'OName\Roles\RolesServiceProvider'
);
Composer.json from the Blog Package
"require": {
"php": ">=7.0.0",
"illuminate/database": ">= 5.0",
"illuminate/support": ">= 5.0",
"OName/taggy": "^1.0"
},
"require-dev": {
"orchestra/testbench": "~3.5",
"phpunit/phpunit": "~6.0"
},
"autoload-dev": {
"classmap": [
"tests/TestCase.php"
]
},
"extra": {
"laravel": {
"providers": [
"OName\\Blog\\App\\Providers\\BlogServiceProviders"
]
}
}
Composer.json from the Taggy Package
"autoload": {
"psr-4": {
"OName\\Taggy\\": "src"
}
},
"require": {
"php": ">=7.0.0",
"illuminate/database": ">= 5.0",
"illuminate/support": ">= 5.0"
},
"require-dev": {
"orchestra/testbench": "~3.5",
"phpunit/phpunit": "~6.0"
},
"autoload-dev": {
"classmap": [
"tests/TestCase.php",
"tests/stubs/TopicStub.php",
"tests/stubs/TagStub.php"
]
},
"extra": {
"laravel": {
"providers": [
"OName\\Taggy\\App\\Providers\\TaggyServiceProvider"
]
}
}
Error:
[Symfony\Component\Debug\Exception\FatalThrowableError]
Class 'OName\Taggy\TaggyServiceProvider' not found