Client has no internet connection despite being connect to the access point
We set up a WiFi network with Omada controller which consists of the ER605 router and the two EAP670 access points. Until now, every device was able to connect to the WiFi network and access the internet.
We recently bought a DJI drone and the RC controller as well. The RC controller is a minimal Android device that provides the bare essentials to operate the drone. However, whenever we try to connect the RC controller to our WiFi network, it can't access the internet. In the Omada admin page, we can't ping the RC controller either. Pinging the RC controller from another machine in the same network doesn't work as well.
This is a peculiar problem since every other device in the network is able to access the internet without problems.
It should be also noted that if we connect the RC controller to a smartphone hotspot network, the internet connection suddenly works.
I am interested whether this problem is familiar to some people and if a solution is known.
Thank you in advance.