Import-HPEiLOCertificate ERROR without details

I am trying to use the HPE PS Module to request and install a certificate on a newly provisioned DL380 G10 server but I am getting the error below.

I know that the problem is not the code or the cert because I imported the same cert manually through the ILO GUI and worked:

$ImportResult = Import-HPEiLOCertificate -Connection $Conn -Certificate $ILOCERTFileName -OutputType RawResponse -Verbose

VERBOSE: Performing the operation "Import-HPEiLOCertificate" on target "IP: x.x.x.x".

VERBOSE: [Import-HPEiLOCertificate] Executing the cmdlets with 1 task serially.

VERBOSE: [Import-HPEiLOCertificate][x.x.x.x]: Creating Redfish request.

VERBOSE: [Import-HPEiLOCertificate][x.x.x.x]: Sending Redfish request to PATCH/POST/DELETE the JSON payload.

VERBOSE: [Import-HPEiLOCertificate][x.x.x.x]: Processing JSON response.

PS > $ImportResult | fl *

Target: x.x.x.x

URL: https://x.x.x.x/redfish/v1/Managers/1/SecurityService/HttpsCert/Actions/HpeHttpsCert.ImportCertificate/

ContentType: application/json

Response: {"error":{"code":"iLO.0.10.ExtendedInfo","message":"See @Message.ExtendedInfo for more information.","@Message.ExtendedInfo":[{"MessageId":"iLO.2.4.ImportCertif

icateFailed"}]}}