UserManagement Admin Web has to run in a 32-bit application pool. To avoid any troubles with existing application pools, create a new application pool as shown in the figure below.
Create new Application Pool in IIS
New application pool "UserManagement"
Do not change the default application pool to 32-bit, if other applications run on a 64-bit default application pool. For this purpose please create explicitly a new 32-bit application pool and use this pool for UserManagement Admin Web.
Be sure to assign the following settings:
•.NET Framework Version: v4.6
•Enable 32-Bit Applications: True
Parameters regarding 32-bit application and identity in IIS
Confirm the settings by clicking on OK. At the end, assign the newly created UserMangement application pool to your UserManagement Admin Web application. Therefore, select the UserManagement Admin Web application and open Advanced Settings.
Assign the application pool UserManagement to your UserManagementAdminWeb application
After having finished all steps so far, restart the Internet Information Services (IIS) Manager. Select the server and click Restart.
Restart Internet Information Services (IIS) Manager