How to add/remove allow sender of distribution group with powershell?

Hello,

Please help me about how to add/remove allow sender of distribution group using Powershell?

I did find a few answers like the one below:

We need toconnect to Exchange online first in powershell. And here is the command to edit the allow list:

set the allow list users addresses:

Set-DistributionGroup "group name" –AcceptMessagesOnlyFrom @domain.com,******@domain.com

add the specific users to allow list:

Set-DistributionGroup "group name" –AcceptMessagesOnlyFrom @{add="@domain.com","@domain.com"}

remove the specific users to allow list:

Set-DistributionGroup "group name" –AcceptMessagesOnlyFrom @{remove="@domain.com","@domain.com"}

use the following command to check the allow list users:

Get-distributiongroup -identity "group name" | fl acceptmessagesonlyfrom

Reminder: we need to type "" in the command in powershell.

However, when I run the command, I get this error:

PS C:\WINDOWS\system32> Set-DistributionGroup "All Security Insurance" AcceptMessagesOnlyFrom @{add="******@xxxxxxxxx.com"}
Set-DistributionGroup : A positional parameter cannot be found that accepts argument 'AcceptMessagesOnlyFrom'.
At line:1 char:1

• Set-DistributionGroup "All Security Insurance" AcceptMessagesOnlyFrom @{a ...

•     + CategoryInfo          : InvalidArgument: (:) [Set-DistributionGroup], ParameterBindingException  
      + FullyQualifiedErrorId : PositionalParameterNotFound,Set-DistributionGroup
  
  

Btw, I use the standard Office 365 portal - it is not on-premises Office.

I would be grateful for your helo, please.

Thank you

Sebastian