Both upgrated to windows 10, one HOME and one PRO.

Windows 10 HOME is on a local account
Windows 10 Pro is on a Microsoft account.

Private and All net-settings are the same on both PC's

From the HOME I can access the PRO while typing the login settings for the PRO (aka Microsoft account and password)

But from PRO to HOME I keep getting "wrong user or password". Is it not possible to connect from a M.S. account to a PC with a local account?

I think I can remember something about reg.settings from an earlier preview of Windows 10, where I needed to do "something" to get my (at that time) Win 7 with local account connected with windows 10 Pro. But what was that reg.editing?