I have a Dji Mavic 2 pro with a smart controller and the drone does connect to the controller and the controller is connected to a functioning wifi network. The controller had access to websites through the browser but the DJI Go app shows that I need a valid wifi connection. Now it won't let me activate my drone and I have tried contacting the support, the support says that there shouldn't be a problem if wifi is connected. Can anyone help me?

Hey, did you try to use a different WiFi Network? Maybe your problem is related to the current network you are using.

If you have not - power everything OFF.  Power stuff back on.  Deselect and re-select your wifi network.  If you can change between frequencies, try that.

As suggested, try a friend's, Starbucks/similar wifi network.

I found a solution now: It is because that I need to install a software update, it is working now.

Hi, we're sorry to know about the problem that you had with your Smart remote controller, however, we're glad to know that you've managed to fix the problem by updating the software of your unit. Please let us know if you have other concerns. Thank you for continued support.

I'm having the same issue.   I'm up to date with the firmware.   Do you need a strong wifi connection in order for the app to work on the controller?  The drone seems to be on without issue.