your credentials did not work (remote desktop, windows 10)

I'm using Windows 10, and I want to connect to another computer using Remote Desktop Connection. It shown "You will be asked for credentials when you connect". Then I need to submit username and password:

I reinstalled Window, and set my name as User without password. But when I submit only username, it shown the error: the credentials that were used to connect did not work. Please enter new credentials.

The thing is, before I reset my computer, I don't need to submit credentials. So what should I do? Thanks.

Below are two methods to enable RDP without password (blank password for user account).

Registry method

• Run regedit
• Position to the key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
• Set LimitBlankPasswordUse to 0 (if not-existent create as DWORD(32 bit))

Local Group Policy method

• Run gpedit.msc
• Position to Computer Configuration > Windows Settings > Security Settings > Local Policies > Security Options.
• Set "Accounts: Limit local account use of blank passwords to console login only" to Disabled
• Click OK.

Microsoft explains the effect of this policy and registry setting as:

This security setting determines whether local accounts that are not password protected can be used to log on from locations other than the physical computer console. If enabled, local accounts that are not password protected will only be able to log on at the computer's keyboard.

For more information with screenshots see the article
How to enable or disable Always Prompt for Password upon Remote Desktop Connection to Windows PC.