If you're unable to login over to Remote Desktop due to this error it's due to the default lockout policy for your OS install is set to lock the account temporarily after so many login attempts. You can either disable the lockout policy completely or change it to a different threshold.

Follow the steps below or go to the following group policy setting in your Windows server,

Step 1: Navigate to Group Policy Editor under Settings

Access the Control Center,

Step 2: Locate Computer Configuration

Dive into Computer Configuration to customize fundamental settings at the heart of your system.

Step 3: Navigate to Windows Settings

Explore the Windows Settings section to fine-tune configurations specific to the operating system.

Step 4: Access Security Settings

Enhance your system's security posture by navigating to and configuring Security Settings.

Step 5: Find Account Policies

Locate and customize Account Policies to dictate the rules governing user accounts on your system.

Step 6: Explore the Account Lockout Policy

Delve into Account Lockout Policy to establish protocols for handling account lockouts.

Step 7: Adjust Account Lockout Threshold

Fine-tune the Account Lockout Threshold to strike a balance between security and user accessibility.

Done.