The property 'applicableArchitectures' does not exist on type 'microsoft.management.services.api.win32LobAppRequirement'

[MortenNormannFrederiksen]

Hello

Why do I get a The property 'applicableArchitectures' does not exist on type
'microsoft.management.services.api.win32LobAppRequirement' when running

$arch = "All"
$WinRe = "W10_1909"

$Win32AppReqRule = @{ }

if($arch) { $Win32AppReqRule["Architecture"] = $arch }
if($WinRe) { $Win32AppReqRule["MinimumSupportedWindowsRelease"] = $WinRe }

$Win32AppReqRule

$IW32AdditionalRequirementRule = New-IntuneWin32AppRequirementRule @Win32AppReqRule

The error comes of course when I run Add-IntuneWin32App @Win32AppArgs

[obuolinis]

My guess is that your $arch comes up empty and Architecture property goes missing.
My guess is wrong of course - New-IntuneWin32AppRequirementRule would not proceed if that were the case. You should provide more details about the error, like the full error message.
You can also try Add-IntuneWin32App @Win32AppArgs -Verbose for more clues.