Angular Material 17 - How to get primary color from theme in Style.scss

I have just upgraded angular app from 16 to 17. Application has custom theme as below.

custTheme.scss

@use '@angular/material' as mat;

@include mat.core();

$pp: mat.define-palette(mat.$indigo-palette);
$primary: mat.get-color-from-palette($pp);
$ap: mat.define-palette(mat.$pink-palette);
$accent: mat.get-color-from-palette($ap);
$wp: mat.define-palette(mat.$red-palette);
$warn: mat.get-color-from-palette($wp);

$theme: mat.define-light-theme((
color: (
primary: $pp,
accent: $ap,
warn: $wp,
),
typography: mat.define-typography-config(),
));

@include mat.all-component-themes($theme);


this seem to be working fine except when I try to get primary color in Style.scss, it doesn't work

style.scss

import '/custTheme';
background-color: mat-color($primary, darker);


It doesn't seem to recognise mat-color function. what I get in browser is

color: mat-color(#616161, darker);


Can someone please explain what's happening here?

Thanks

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