Iowa Code Title VIII. Transportation [Chs. 306-330B] § 321A.20. Certificate furnished by nonresident as proof

1. The nonresident owner of a motor vehicle not registered in this state may give proof of financial responsibility by filing with the department a written certificate or certificates of an insurance carrier authorized to transact business in the state in which the motor vehicle, or motor vehicles, described in such certificate is registered, or if such nonresident does not own a motor vehicle, then in the state in which the insured resides, provided such certificate otherwise conforms with the provisions of this chapter, and the department shall accept the same upon condition that said insurance carrier complies with the following provisions with respect to the policies so certified:

2. If any insurance carrier not authorized to transact business in this state, which has qualified to furnish proof of financial responsibility, defaults in any said undertakings or agreements, the department shall not thereafter accept as proof any certificate of said carrier whether theretofore filed or thereafter tendered as proof, so long as such default continues.