Can’t bind to ‘x’ since it isn’t a known property of ‘y’

I went back to the start and realised what I missed:

In feature-b.module.ts I should have exported the component:

exports: [
    FeatureBComponent
]

It was also necessary for me to import FeatureBModule rather than FeatureBComponent.

import { FeatureBComponent } from ‘../feature-b/feature-b.component’;

import { FeatureBModule } from '../feature-b/feature-b.module';