@Jrft1379
If this new password has any special characters, try removing them and see if the Express now connects. (the special character that may be the culprit varies between Roku devices and router model numbers.) The Express models are reported to have an issue with the pound symbol (#) in most cases.
Go into your router settings (or use your router's app if available) and change the SSID passwords to eliminate the special characters.
If the special character is not the issue, make sure the router is using WPA2-Personal encryption. If using a wifi6 router, make sure the setting is not just using WPA3. Need to use WPA2/WPA3.
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102