'IonIntlTelInputModule' does not appear to be an NgModule class.

This likely means that the library (ion-intl-tel-input) which declares IonIntlTelInputModule has not been processed correctly by ngcc, or is not compatible with Angular Ivy. Check if a newer version of the library is available, and update if so. Also consider checking with the library's authors to see if the library is expected to be compatible with Ivy.