Failed to create assemble name object for Microsoft.UpdateServices.Administration. Error = 0x80131701

When a Software Update Point is installed on a remote server, the WSUS synchronization will fail with various error messages;

The component status will display;

WSUS synchronization failed.

Message: WSUS update source not found on site. Please refer to WCM.log for configuration error details.

Source: getSiteUpdateSource

The operating sysem reported error 2147500037: Unspecified error

The WCM.log on site server will show;

Failed to create assembly name object for Microsoft.UpdateServices.Administration. Error = 0x80131701.

Supported WSUS version not found

Remote configuration failed on WSUS Server.

wsyncmgr.log on site server will show;
Sync failed: WSUS update souurce not found on site. Please refer to WCM.log for configuration error details.

On the Software Update Point Synchronization Status node, the catalogue version and any synchronization details never get updated;

If we re-review the WCM.log file, few lines before actual error msg (failed to create assembly name object), it is checking for supported versions of WSUS and returns Did not find supported version of assebly Microsoft.UpdateServices.Administration,

So the actual problem is it cannot find WSUS administration UI on the site server.
First try installing on the site server without uninstalling SUP role and WSUS. If the problem still appears then remove the SUP, Uninstall WSUS, delete the SUSDB from the SQL server.
Restart the remote server then install and configure the WSUS, then install WSUS Admin tools on the site server then install SUP role.

 To install Windows Server update services tools, Launch Add Roles and Features Wizard,

Select Role-based of feature-based installation on Select Installation Type;

 Select a server from the server pool on select destination server then click next;

Click next on Select server roles as we do not have to install any roles;

Select Windows Server Update Services Tools under Role Administration Tools.
make sure API and PowerShell cmdlets and User Interface management Console are selected.

Confirm the installation selections then click install. This will install WSUS console on the primary site.

If you have already installed the SUP role, then sync the updates.