Angular form updateValueAndValidity of all children controls

I had the same situation for me to update FormGroup | FormArray at nested level controls.

check this out(worked for me):

/**
 * Re-calculates the value and validation status of the entire controls tree.
 */
function updateTreeValidity(group: FormGroup | FormArray): void {
  Object.keys(group.controls).forEach((key: string) => {
    const abstractControl = group.controls[key];

    if (abstractControl instanceof FormGroup || abstractControl instanceof FormArray) {
      updateTreeValidity(abstractControl);
    } else {
      abstractControl.updateValueAndValidity();
    }
  });
}