MY_MODULE_entity_bundle_field_info_alter not firing in multistep commerce checkout page

I am trying to add a custom validation constraint $fields[‘field_phone_number’]->addConstraint(‘CommercePhoneNumber’); via MY_MODULE_entity_bundle_field_info_alter but am having trouble getting the hook to fire off in my multistep checkout page inside the commerce module. I tried MY_MODULE_entity_base_field_info_alter as well but that did not work either. I’ve seen many examples online of adding custom constraints with this method, but…

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