@Neuf512 

I assume you are trying to connect it to the 'LAN' 2.4 5 or 6Ghz bands that have WPA3 Security?

The Amaxon probably only works with WAP2 I assume.

Easy FIX, enable the GUEST network and set it to WPA2 security. Should work fine.

Don't have that router, so I'm only suggesting what I'd try?

  @Neuf512 

Congratulations on your new TP-Link AXE5400 router! While it’s true that the highest security level, WPA3, might not be supported by some older devices like Amazon Fire Sticks, you can still ensure a high level of security by using WPA2, which is widely supported and offers robust protection. Here are a few steps to enhance your network security:

1. Use WPA2 for Compatibility: Set your router to use WPA2 security, which will be compatible with your Amazon Fire Sticks and other older devices.
2. Separate Networks: Create a separate guest network for devices that do not support newer security technologies, keeping them isolated from your primary network.
3. Strong Passwords: Ensure your Wi-Fi network uses a strong, unique password.
4. Firmware Updates: Regularly update your router's firmware to ensure you have the latest security patches.
5. Network Monitoring: Use the router’s built-in network monitoring tools to keep an eye on connected devices and unusual activity.