I have different usernames in MPH and Suprnova. Any way to add an username for each? Or am I better off creating a new account on Suprnova?
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Not necessary new suprnova login, you can edit suprnova.json file on pools folder and replace :

User = "$Username.$WorkerName"     

to 

User          = "YOURSPRNOVALOGIN.$WorkerName"

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This worked for me on before but since the new update it gives me a authentication error. 
I remember before I edited $username in 2 places in the suprnova file, but this time it I only found it in one place (end of the page).
Turned off wtm virtual for now.