Anyone else having problems with the SD Card slot on the RC controller not recognizing any card?

Try a SC Card that works in the drone  and then give it a try in the RC and see if it still works.  If not, you will probably have to contact DJI Support and send the drone in for repair.

It finally worked

Hello there. Thank you for reaching out. We're glad that you already managed to isolate the issue. Should you have other inquiries, please don't hesitate to reach us. Thank you for your valued support.

djiuser_jSGIzBJfhmmt Posted at 12-23 15:19
It finally worked

That's great news.  Glad you got it working.  Happy holidays!