However, Tang China was wracked with turmoil due to the Anshi Rebellion (An Lushan's rebellion), and consequently the Tang court refused to allow FUJIWARA no Kiyokawa to return to Japan, citing the dangers of the road; as a result, Ko Gendo was unable to fulfill his objective.
しかし、当時は安史の乱により唐は騒乱状態であったため、行路の危険を理由に唐側は藤原清河の帰国を許さず、高元度は目的を果たせなかった。