Ctrl + S and Ctrl + X don’t work by default

For the past several months I installed Microsoft 365 suite on a bunch of Windows 10 laptops. Every time the same problem occurred: the shortcut keys “Ctrl S” and “Ctrl X” didn’t work by default. Instead, one should use “Shift F12” and “Shift Delete”. Of course, there is a two-minute workaround – I just go to the Ribbon Settings and add those missing shortcuts. However, my question is why is it like that? Even according to the official Microsoft’s page on shortcut keys these should be in place (check out the following link https://support.microsoft.com/en-us/topic/keyboard-shortcuts-in-word-95ef89dd-7142-4b50-afb2-f762f663ceb2#PickTab=Windows).

Does anybody else experience the same problem? Do I do something wrong during the installation? Interestingly enough, there is no such problem on Office for Mac. Also, for those wondering, I did use different Microsoft accounts for different Windows machines. Please, help me figure out what’s wrong with the Office.