How to export members from Domain Local Security group ?

Use Get-ADGroupMember instead.

Get-ADGroupMember group | Select-Object -ExpandProperty Name

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Or

(Get-ADGroupMember group).Name

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Nada

PS C:\scripts> Get-ADGroupMember COMPANY-RDSPortal-TSUsers-LGRP | Select-Object -ExpandProperty Name
Get-ADGroupMember : An unspecified error has occurred
At line:1 char:1
+ Get-ADGroupMember COMPANY-RDSPortal-TSUsers-LGRP | Select-Object -ExpandProperty Nam ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (COMPANY-RDSPortal-TSUsers-LGRP:ADGroup) [Get-ADGroupMember], ADException
    + FullyQualifiedErrorId : ActiveDirectoryServer:0,Microsoft.ActiveDirectory.Management.Commands.GetADGroupMember

PS C:\scripts> Get-ADGroupMember (COMPANY-RDSPortal-TSUsers-LGRP).Name
COMPANY-RDSPortal-TSUsers-LGRP : The term 'COMPANY-RDSPortal-TSUsers-LGRP' is not recognized as the name of a cmdlet, function, script file, or operable prog
verify that the path is correct and try again.
At line:1 char:20
+ Get-ADGroupMember (COMPANY-RDSPortal-TSUsers-LGRP).Name
+                    ~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (COMPANY-RDSPortal-TSUsers-LGRP:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

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Apologies... Mobile posting. The group name should be in quotes.

same thing

PS C:\scripts> Get-ADGroupMember "COMPANY-RDSPortal-TSUsers-LGRP" | Select-Object -ExpandProperty Name
Get-ADGroupMember : An unspecified error has occurred
At line:1 char:1
+ Get-ADGroupMember "COMPANY-RDSPortal-TSUsers-LGRP" | Select-Object -ExpandProperty N ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (COMPANY-RDSPortal-TSUsers-LGRP:ADGroup) [Get-ADGroupMember], ADException
    + FullyQualifiedErrorId : ActiveDirectoryServer:0,Microsoft.ActiveDirectory.Management.Commands.GetADGroupMember

Bleh, no reason for that to fail. Two more ways.

Get-ADGroup "COMPANY-RDSPortal-TSUsers-LGRP" | Get-ADGroupMember | Select-Object -ExpandProperty Name

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And

$groupDN = (Get-ADGroup "COMPANY-RDSPortal-TSUsers-LGRP").DistinguishedName
Get-ADUser -Filter { memberOf -eq $groupDN } | Select-Object -ExpandProperty Name

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It worked the second one but inconsistent results, remember that group contains internal users, groups and external people. If you open AD and through the Attribute Editor tab and select Member then the other window comes up...see attachment
Capture00.PNG

That's likely because our second search is limited to user objects. If you need everything, and Get-ADGroupMember isn't playing we can try this one:

$groupDN = (Get-ADGroup "COMPANY-RDSPortal-TSUsers-LGRP").DistinguishedName
Get-ADObject -Filter { memberOf -eq $groupDN } | Select-Object -ExpandProperty Name

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MemberOf is back-linked to the member attribute so the two searches are mostly the same thing (mostly because not everything has memberOf, even if it can be a member, edge cases).

We can also drop all the way back to your original and adapt that one and ensure we have exactly the same thing.

(Get-ADGroup "COMPANY-RDSPortal-TSUsers-LGRP" -Properties *).members | ForEach-Object {
    $DN = $_.DistinguishedName
    Get-ADObject -Filter { DistinguishedName -eq $DN }
} | Select-Object -ExpandProperty Name

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It's a bit longer, that really wouldn't have worked on my mobile :)

Hmm, i like the first one. How do i sort the list ? "| Sort Name" did not work.

$groupDN = (Get-ADGroup "COMPANY-RDSPortal-TSUsers-LGRP").DistinguishedName
Get-ADObject -Filter { memberOf -eq $groupDN } | Select-Object -ExpandProperty Name

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Bingo. Thank you sir