Re: Nothing to see it will be sorted
In fact, network shares becoming inaccessible upon switching from a local a/c to an MS one is a bug that's been around since Win8.
Despite battling with this for hours on various occasions, only today I happened upon a 'fix'.
Before I continue, I must add that this is for Windows 8 & later boxes with a network share accessible to all ie without a password that previously worked but stops working when the user a/c is changed from a local one to a Microsoft one.
Check the permissions for the share. I found 'Everyone' was missing. So I added it with the required r/w settings.
Next, I tried to browse to the share over the LAN from another machine. I still got the dreaded password prompt. On a hunch, I typed in 'Everyone' for the username and left the password blank. It worked and continues to work just fine.
But yes, some parts of Windows 10 suck. But I'm forcing myself to tame it. Not as bad as Win ME for flakiness, and the opposite of Vista for speed, but I've had to migrate to it for my main machine as the recently acquiree i7-6700K is definitely more responsive under 10 than 7.