Can't boot up/install Win10 from USB stick made with RUFUS

I am an IT volunteer in a UK charity.  We are purchasing replacement laptops and some desktops so that we can run Windows 11. (Even though our current machines running Win10 and doing a fine job)!  I am then taking the Windows 10 machine and cleaing as best I can and doing a fresh iinstall of Windows 10.  Machine as above Latitude E7470.  Using using RUFUS 4.2 I build a bootalbe USB install Windows stick.  Boot up F12 one time boot option - I only see 2 options;  boot manager & internal disk! (no USB stick).  The Win10 is 22h2 build 19045.3208.  However if I get the MS media creation tool to create the USB stick it is then seen. Aka one time boot I see 3 options  boot manager internal disk AND USB boot device.   I have queried this with RUFUS they say it maybe Dell are a bit notorious for not following the UEFI specs, and I am aware of instances where the USB media created by Rufus, which are fully UEFI compliant but may contain a UEFI bootable partition that doesn't reside at the beginning of the media, is not being recognized properly by Dell UEFI firmwares. I have ensured the latitude firmware is fully up to date.  Any ideas within the community what is going on.  I have used RUFUS iso install USB approach many times  I haven't run into this before.  I used this approach to take my Dell Tower up to Windows 11 ok.  And at the charity done many other PCs and laptops this way.  So help appreciated.