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src/app/signup/core/password.matcher.ts

+import { FormControl, FormGroupDirective, NgForm } from '@angular/forms';
+import { ErrorStateMatcher } from '@angular/material';
+
+// From: https://stackoverflow.com/a/51606362
+export class PasswordErrorStateMatcher implements ErrorStateMatcher {
+  isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null): boolean {
+    const invalidParent = !!(control && control.parent && control.parent.invalid && control.parent.dirty);
+    return (control && control.dirty && invalidParent);
+  }
+}