RDP Sign reporting unable to use certificate

It turns out that if you don't specify a computer name, rdpsign fails with error 0x80070490.

Could you try my script?

It normalizes the HASH, that seems to be the issue, tried it without this script today but it failed also with the same error code, then found my script again which I used last year.

#For some Reason using a variable hash does not work. Please use the $hash variable to normalize the string and then paste it into the Foreach loop.  
$hash = ("Fill in hash here").ToUpper().Replace(" ","")  
  
  
#Multiple Files in 1 Directory  
$files = get-childitem c:\temp\ -filter *.rdp  
  
foreach ($file in $Files) {  
$RDPFile = $file.VersionInfo.FileName  
rdpsign /v /sha256 'Fill in Hash value from $hash here' $RDPFile  
}  

Have you compared the Enhanced Key Usage that are selected for the old certificate?
These should be client/server authentication.