[Solved] The problem that Unity Hub fails to obtain a license or does not respond and cannot develop

Development platform: Unity
Programming platform: Visual Studio 2020 or above
Language used: C#
 

Special Instructions

  The content of this solution is provided by the external network, namely Solutions for Unity Lara Developers.Very effective and helpful for my own problems.
 

Lara's problem analysis:

   Sometimes the licenses we apply for may cause problems due to differences in the types of physical equipment systems deployed.In effect, a license-related file validation exception will result.It is assumed that this license was activated on a new device.Of course, assuming you've reached your activation limit, this can cause problems.
 

Lara's solution:

• Option 1: Uninstall and reinstall Unity Hub and Unity Editor.
• Option 2: Delete the C:ProgramData/Unity/Unity_lic.ulf file in the Windows directory and apply again.
  This file is part of the Unity license file.In most cases, removing the license will resolve the issue.