The Azure Migration Service can be used for assessment. This document explains how to use Azure Migration to assess an on-premises Hyper-v-based environment.
I had only non-domain Windows Servers on Hyper-v. For the credentials I added the credentials for Windows Servers and Hyper-v Host. I used the Username and Password of the servers. For the Hyper-v Host I used a local admin user.
Username: hyper-v-host-machine-name\local-admin-username
(ex. del0074\parisaadmin)
Password: The password
To discovery source the following values are required.
IP Address/FQDN: hyper-v-host-machine-name(ex. del0074)
Map credentials: host
Multi Cloud Solutions 