Error 51099 on 3DS with Pokemon White?

I’ve tried every DNS combination I can from the guides but I keep getting the 51099 error code when I try to use mystery gift on my 3DS. I am using a hacked version of Pokemon White off my SD card instead of my legit cartridge so maybe that’s why? Or is there a specific DNS setting I should do in my 3DS settings that will still work?

I can try setting up a specific WiFi band through my router that only targets the wiimmfi server if need be but I’m hoping I don’t need to do that just cause it’s more time consuming.