WC "My Account" Not Found – 404 error

Hey!

I am setting up my page https://www.akcesoria-kempingowe.pl/ and everything works fine, products, categories, cart etc. except “My Account” – I am getting this:

Not Found

The requested URL /konto/ was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

I googled many pages and solutions, tried flushing permalinks, deactivating plugins etc.

Strange thing is that, when I use [woocommerce_my_account] shortcode on new page – it works. But when I arrange this new page to WC/Settings/Accounts->My account website, it break down.

Any solution on that?
Page: https://www.akcesoria-kempingowe.pl/
My account page: https://www.akcesoria-kempingowe.pl/konto/
https://www.ads-software.com/plugins/woocommerce/