My DS does find an Access Point but won't connect

Hello everyone, it's pretty much the titel, maybe someone can help me with this issue.

I want to do the DNS thing and since I'm an iPhone user, I cannot setup a passwordless hotspot.

So I decided to remove my home Wi-Fi's password completely so my DS can find it. I know I should use WEP encryption but my Wi-Fi device is too modern, it only does WPA2 and upwards...

Well, my DS can find the Access Point and everything seems fine (full signal, green colored)

BUT when I test the connection it turn red and no signal, followed by Error Code 50099 (no AP in range)

Whats the issue? Hopefully some can help