angular 19 - APP_INITIALIZER deprecation

I am trying to upgrade from angular 18 to 19. Automatic migration changed the following code

providers: [
{
provide: APP_INITIALIZER,
useFactory: initializeApp1,
deps: [AuthService],
multi: true
},
]


to this:

providers: [
provideAppInitializer(initializeApp1(inject(AuthService)))
]


however when I run the code I am getting error Uncaught RuntimeError: NG0203: inject() must be called from an injection context such as a constructor, a factory function, a field initializer, or a function used with runInInjectionContext. Find more at https://angular.dev/errors/NG0203

I am pretty stuck as to how to solve this error, could you help me?

thanks a lot

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