Why did this happen? wifi password problem

I would be grateful if anyone could enlighten me.
Yesterday I spent some fruitless hours trying to set up my airport express to join my wifi network. (DGND3700 Simultaneous dual band 2.4GHz & 5GHz)
After a few failed attempts I tried establishing a connection thru a password free channel and succeeded.
Again after a few more failed attempts I searched this forum and read Henry B.'s advice.
https://discussions.apple.com/message/6611596#6611596
Most problems at this point are due to not correctly implementing the same wireless network security protocol and password on both the wireless router and the Airport Express. What method are you using (WEP or WPA)? If you have the option on your wireless router, select WPA with TKIP encryption.
I changed the security setting on the DGN from WPA2-PSK (AES) to WPA-PSK (TKIP)  and it worked.
I wondering why it does’t work with WPA2-PSK (AES) and also why there is no mention of this easily found in the so called setup manual or elsewhere.
Thank you Henry B. for your advice.

The WPA wireless security equivalents for AirPort & other manufacturers routers are as follows:
WPA - Non-Apple: WPA-PSK (TKIP) = Apple: WPA/WPA2 Personal
WPA2 - Non-Appler: WPA-PSK (AES) = Apple: WPA2 Personal
In theory, when you first attempted to join the DGND's Wi-Fi network with the AirPort Express, it should have recognized the wireless security type as WPA2 Personal when it encountered your router's WPA2-PSK (AES) setting. However, it may also fall back to WPA/WPA2 Personal which (in theory) attempts to connect with AES first, then TKIP when that fails. Note: AES is a much stronger encryption key vs. TKIP.
It may just be possible that the AES implementation for each router is just off enough to make that setting incompatible.

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