Certificate export issue if the computer cerftificate was issued by enterprise PKI with property Exportabe=false

We are trying to create a network controller in an environment with GPO policy that forces creation of computer certificates with disabled Exportable property.
The script failed on this line:

SDN/SDNExpress/scripts/SDNExpressModule.psm1

Line 355 in cdadc57

    
           [System.io.file]::WriteAllBytes($TempFile.FullName, $cert.Export("PFX", $certpwdstring)) | out-null

Is it really necessary to export a certificate with a private key to add it to the trusted root location?