Here is the list of Windows versions. Win10 and Win11 supported. The sentence "(standalone or as part of other Microsoft 365 plans)" excludes the domain needs.
https://learn.microsoft.com/en-us/microsoft-365/security/defender-endpoint/minimum-requirements?
view=o365-worldwide
Here is the link for Android. No information about the specific version therefore it is supported.
https://learn.microsoft.com/en-us/microsoft-365/security/defender-endpoint/microsoft-defender-endpoint- android?view=o365-worldwide Here is the link for MacOS System requirements: 14 (Sonoma), 13 (Ventura), 12 (Monterey). MAC OS X is older therefore unsupported.
https://learn.microsoft.com/en-us/microsoft-365/security/defender-endpoint/microsoft-defender-endpoint- mac?view=o365-worldwide