GT-BE98 incorrect password error

[FNU0180]

I have the same issue as described here: GT-BE98 6GHz issues - Republic of Gamers Forum - 1013919 (asus.com) (unfortunately this is closed, however, none of the possible solutions there worked).

In short: All devices will show incorrect password (I did not change the password and the devices were logged in properly just before). In the settings the correct password is displayed. 

I tried restarting the router, reflash it with the latest firmware and resetting, but nothing works. The guest networks always works, there is no incorrect password error. 

Same issue here: Asus GT-BE98 Forgets Wifi Password (except guest) | SNBForums

And also here: ASUS GT-BE98 forgets WIFI password (700$ router does not work properly) : r/ASUS (reddit.com)

Is there any fix?

Update 24/08/15: 😱

• I can reproduce the problem by rebooting the router. Everytime I reboot the router all connected devices will show the incorrect password error. I can then temporarely fix it by >Wireless>General, click "WPA Pre-Shared Key" (that still shows the correct password that I initially set), delete the password, re-enter the identical password and click "Apply"
  
• The problem occurs with both, Smart Connect enabled or disabled
• I do not use WiFi7 or MLO
• Resetting the router did not solve the problem

[Saltgrass]

You are using WPA2 and WPA3 for the primary or MLO SSID?

Any chance there is a situation with your password where some specific characters are not allowed.  I ask this because Windows 11 is working on allowing use of additional symbols, such as emojis.

[FNU0180]

Thank you. 

I tried both WPA2 and WPA2/WPA3, it did not work.
I use a "$" sign in the password, could that cause the problem?

[Saltgrass]

I use a dollar sign, so that should not be involved?

[FNU0180]

So a $ in the password is OK?

[jzchen]

I only use numbers...  😬

[FNU0180]

Thank you. 
I tried both WPA2 and WPA2/WPA3, it did not work.
I use a "$" sign in the password, could that cause the problem?

[Rooke]

This is a long shot, but in the past I've seen some systems (not routers) that didn't like special characters ($%#@!) in the 1st position (leftmost) of the password. 

[Saltgrass]

Any chance you have different passwords for the MLO SSIDs and another network's SSID?

[FNU0180]

I use different passwords for the normal WLAN and the guest WLAN