NETSDK1135: SupportedOSPlatformVersion can't be higher than TargetPlatformVersion

The value that your project file specifies for SupportedOSPlatformVersion is too high. The full error message is similar to the following example:

SupportedOSPlatformVersion <Version> cannot be higher than TargetPlatformVersion <Version>.

Check your project files for SupportedOSPlatformVersion. TargetPlatformVersion (TPV) is inferred from the TargetFramework value. For example, net6.0-windows10.0.19041 will set the TPV to be 10.0.19041. .NET uses TargetPlatformVersion to determine which APIs are available at compile time.