Wi-Fi Wrongly Displaying "Incorrect password"

[PhoneHelperUK]

Hi All.

Bit of a weird one, this.

My phone and an S22 Ultra which are both connected to the same WiFi network, and have both worked for over a year now, are beginning to say "Incorrect password" whenever I connect to the network.

Simply, this is surely because of a mistyped password? Well, it cannot be, as the password has not changed since I put it in, and since it has worked for a year, this has to be the nearest "cover up" message for a more major issue.

No other devices on the WiFi have this problem. There are three other Samsung devices (Note3, A5, S20 FE) and all have no problems. Not a problem with the WiFi itself.

Done the basic things - restarted the phone, removed all known WiFi networks, turned off intelligent features etc etc.

Issue still occurs.

At all costs possible, I would like to avoid performing a factory reset. It's a complicated process and will use up a weekend, which may lead to no fix.

Any advice?

Many thanks!

[Pugs1957]

Try rebooting your router

[AndrewL]

@PhoneHelperUK: Please can you try heading to Settings > Connections > Wi-Fi > On > Tap the cog to the right of your router > Forget > Toggle Wi-Fi off, then on again > Select your router from the list of available networks, and fill in the required fields. Let me know if this helps. 

[Jaish-M]

I tried this method, but my home wifi keeps disconnecting and saying "incorrect password", but when I click on the wifi, it works without re-entering a password.

This issue started for me since the last Samsung OS update.

All my other devices connect to the wifi with no issues. Its not a router issue.

[JordanS]

Even though other devices are unaffected, this doesn't rule out an issue with the router. It's good to cover all bases when diagnosing where the issue lies. If restarting your router hasn't helped, as suggested by @Pugs1957, test how your phone performs connecting to another router and see if the same issue persists.