WiFi authentication no joy.

My pad worked 2 years ago, before it went into storage. Now, it connects to a public WiFi, says it is strong, but the WiFi requires a password. When I enter that, it repeats the same log in screen, and never accepts the password. I have an iPad that accesses the WiFi fine. 2 years ago it was able to get on wifi’s no problem if public or private. One message does pop up when this happens, but it is gone in a flash.

Tried the typical turn off WiFi, reboot, airplane mode, reboot,, not sure what else to try.

Thanks for any input.