The Japanese emperor had planned to send troops to help the Tang Dynasty quell the an-Shi Rebellion, but why did the plan end in the end?

The Japanese emperor had planned to send troops to help the Tang Dynasty quell the an-Shi Rebellion, but why did the plan end in the end?
During the national disaster, the army and people of the Tang Empire took up arms and fought the War of Resistance.

in 755 AD, the Shi Rebellion, a major event that changed the course of the Empire, took place in the Tang Empire. A Lushan and Shi Siming commanded 200000 rebels from Hebei to the south, through Henan, to Shaanxi and other places to attack all fronts, occupying Chang'an and Luoyang, and the Datang Empire faced the most severe crisis since the founding of the people's Republic of China.

Why does Japan have a plan to help the Tang Empire send troops to counter the rebellion?


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then why did the Japanese plan to send troops to help the Tang Empire quell the rebellion stop?