Utah Code § 81-8-711
§ 81-8-711. Modification of convention child support order.
(1) A tribunal of this state may not modify a convention child support order if the obligee remains a resident of the foreign country where the support order was issued unless: (a) the obligee submits to the jurisdiction of a tribunal of this state, either expressly or by defending on the merits of the case without objecting to the jurisdiction at the first available opportunity; or (b) the foreign tribunal lacks or refuses to exercise jurisdiction to modify the foreign tribunal's support order or issue a new support order. (2) If a tribunal of this state does not modify a convention child support order because the order is not recognized in this state, Subsection 81-8-708(3) applies.