Ok, ok, guys--I believe you.
Guess I'm just doing something wrong,
but I had this same problem 2 years ago trying to get a bootoable Win7 flash drive to work. Until I found
WiNToBOOTIC utility. This one has worked consistently, however, it does not work with either version of Win10 ISO files available on Microsoft's Media Creation Tool page. Good to know about Rufus--that doesn't work as I said, on any of about 5 different machines; including both Desktop PCs and laptops; nor does Microsoft tool. I had this same problem with Win7 & Win7 Pro like I said until I finally got it to work. So, I just have to keep working on it. (yet another project!!).
It's just interesting that the majority of my Clients and forum users have this same problem--that's why I mentioned it in my post to the OP.
I've probably had 50 users across all the forums I volunteer on tell me that they can't get the Win10 boot flash drive to work either. So, it's not just me
. I've had the discussion with them, and listed all the tools mentioned above, including some other ones not mentioned--and most just give up cause it doesn't work the majority of the time. I'll refrain from mentioning the problem unless the OP specifically tells us he cannot create the USB boot drive for Win10 after we instruct them to do so.
<<<BBJ>>>