Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello IT-SPT-UK,
Thanks for posting your concerns in the forum. According to my experience, Devilfish is one of the service principals from Azure Active Directory. There are many such principals at the backend. If you run cmdlet Get-MsolServicePrincipal, you can find it like the screenshot below. Don’t worry about it. I have searched online, but haven't found any related documents. If you want to know more about it, I can help you contact the relevant team.
Hope the information above helps!
Regards,
Rick