What is the main reason why Dayuan in Nurhachi Shaling did not attack Guangning?

The main reason why Nurhachisha made Dayuan not attack Guangning was to wait for the inside.

Guangning's strategic position is very important. It is the throat of western Liaoning, the gateway to Shanhaiguan and the barrier to defend the capital. Since the establishment of the Ming Dynasty, the company commanders of Liaodong have been stationed here. It was the highest military station in the northeast of Ming Dynasty, and it was an important military town to control Mongolia and suppress Jurchen.

With the massive attack of Nurhachi, Shenyang and Liaoyang, the core towns of the Ming Dynasty, were successively lost, and Yuan Yingtai, commander-in-chief of Liaodong in Daming, hanged himself after the defeat. Daming's ruling and opposition parties were very shocked. So the Apocalypse Emperor enabled Xiong Tingbi, one of the three outstanding figures in Liaodong, as the governor of Liaodong, and appointed Wang Huazhen as the governor. When they arrived, they each put forward a strategic plan against the post-Kinnurhachi. However, the plan is different and fragmented. On the other hand, after Jinnurhachi occupied the east of Liaohe River, he was ready to continue to attack western Liaoning on a large scale.