Microsoft has created a Windows App for iOS, iPadOS, macOS, Windows, and web browsers. From a report:

The app essentially takes the previous Windows 365 app and turns it into a central hub for streaming a copy of Windows from a remote PC, Azure Virtual Desktop, Windows 365, Microsoft Dev Box, and Microsoft’s Remote Desktop Services.

Microsoft supports multiple monitors through its Windows App, custom display resolutions and scaling, and device redirection for peripherals like webcams, storage devices, and printers. The preview version of the Windows App isn’t currently available for Android, though. The Windows App is also limited to Microsoft’s range of business accounts, but there are signs it will be available to consumers, too. The sign-in prompt on the Windows App on Windows (yes that’s a mouthful) suggests you can access the app using a personal Microsoft Account, but this functionality doesn’t work right now.