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