All other users except admin are redirected to homepage

After migrating my wordpress site users who are not Admins are redirected to the site’s homepage after login. On the old site they were redirected on wp-admin. The Administrator is redirected to wp_admin as it should.

I want the users to be redirected to wp-admin after login.

I changed siteurl from the database (wp_options), also added this filter in my functions.php:

function my_login_redirect( $redirect_to, $request, $user ) {

    return admin_url();
}

add_filter( 'login_redirect', 'my_login_redirect', 10, 3 );

Any help please? Thank you and Happy Easter!