The experienced problem occurs in the East Wind campaign during the Preventive Diplomacy. Upon taking the solar energy base and regrouping before taking the next town, open the UAV and target with the laser. Attempts to call artillery strikes seem to have no effect. Despite the verbal communication about firing the rounds and the "splash" confirmation, no rounds were observed or heard striking anywhere in the vicinity.
I tried playing with the laser, like pressing T to see if it was necessary but that didn't seem to help. I tried different types of rounds but none have landed.
This isn't my video, but it shows the experienced issue: https://www.youtube.com/watch?v=U4U9ZW9wmG8&t=2s
As the artillery has a major role to completing this mission, marking the severity as Major.
I haven't tried restarting this mission, but every time I load a recent save in this mission, the problem persists. So, marking reproducibility as always.