SSH not working to XenServer Host

I have created a SSH Connection to my XenServer, however the credential passthrough does not seem to work.

I have created a private Vault entry for my host, made it globally available and set my ssh Session to search for it.

When I double click on it I am prompted for password, but even if I manually enter the password I am unable to authenticate.

As a test I right clicked the Session in RDM and click "Copy username" or "Copy Password" and paste it to notepad to check the results and they are good. However if I click "Copy Username and Password" and paste the results it is blank, not so much as a carriage return (only mentioning it as a potential symptom)

Running version 2019.2.19.0