Angular Formly with dynamic custom datetime field is not showing validation message on form submit

[sohaibameenvivup]

`ngOnInit(): void {
this.setFields();
}

private setFields() {
this.fields = [
{
key: "dateOfBirth",
type: "custom-date",
templateOptions: {
label: "FamilyPay.CreateHolidayClubOrder.EmployeeBirthDate",
type: "date",
minAge: this.model.dateOfBirth ? null : 18,
maxAge: this.model.dateOfBirth ? null : 80,
translate: true,
disabled: !!this.model.dateOfBirth,
required: true,
},
},
];
}

`

Datetime validation is working with Min and Max range but I want to add another validation which validates the date when no value for datetime is selected so It should show a regular message "Date of birth is required"

That would be great if somebody can suggest something on it. Thanks