Likely causes
- Device supports only 2.4 GHz while the network name exists on 5 GHz
- WPA3-only or mixed security mode not supported by older firmware
- Special characters in the password rejected by the device keyboard
- MAC filtering or access control list on the router
- Router band steering hiding the 2.4 GHz SSID
Quick checks
- Check the device specifications for the supported bands
- Temporarily disable WPA3 or use WPA2/WPA3 mixed mode
- Try the password on a phone keyboard to spot typing issues
- Look for MAC filtering in the router settings
Step-by-step fix
Separate the 2.4 GHz and 5 GHz SSIDs on the router
Connect the device to the 2.4 GHz network
If it fails, set the router to WPA2-PSK for the test
Temporarily disable band steering and access control
After the device connects, restore security settings one at a time