Dell laptop not seeing Huawei LTE router

We recently attended a customer call whose Dell W10 laptop can’t see their Huawei Wi-Fi router listed under the Wi-Fi networks

Other devices can see and join the router.

Tried disabling and re-enabling the Wi-Fi adapter but there was no change

Looked at the Wi-Fi network app on my Smartphone and I could see the router but noticed it’s transmitting on Ch 13 on the 2.4GHz band
Ch13 is used in Europe but not in the US or SA normall.

Logged into the router as this problem can be caused by the country not being set up correctly but it showed SA correctly

I saw that the Wi-Fi channel was set to Auto in the router.
Changed the channel to 11 and the router appeared in the Dell’s list!
Put it back on Ch 13 and the router disappeared