Hi @Eric Zhou ,
You are eligible to access Windows 10 and Windows 7 with Windows Virtual Desktop if you have one of the following per user licenses*:
Microsoft 365 E3/E5
Microsoft 365 A3/A5/Student Use Benefits
Microsoft 365 F3
Microsoft 365 Business Premium**
Windows 10 Enterprise E3/E5
Windows 10 Education A3/A5
Windows 10 VDA per user
Read more:
https://azure.microsoft.com/en-us/pricing/details/virtual-desktop/