Add-PnPOffice365GroupToSite blows up on alias parameter

Question

Using the script posted here:

https://docs.microsoft.com/en-us/sharepoint/dev/transform/modernize-connect-to-office365-group

I am trying to add an Office 365 group to a standard Team site collection (classic experience).

Log records just before error show:

Enabling modern page feature, disabling modern list UI blocking features
Call groupify API with following settings: 
Alias=classic3grp, IsPublic=True, Classification=Low Impact

Alias name is classic3grp, no spaces or special chars, yet continue to get an error trying to add a group with that alias.

PnP cmdlet rejects the alias string.

In Groups Admin, that group alias is not already out there.

Add-PnPOffice365GroupToSite : {"odata.error":{"code":"Request_BadRequest","message":{"lang":"en","value":"Property
classification has an invalid value."},"requestId":"dbd96438-56a5-4aa8-88d4-722a63893eca","date":"2018-06-27T18:09:50",
"values":[{"item":"PropertyName","value":"classification"},{"item":"PropertyErrorCode","value":"InvalidValue"}]}}
At C:\downloads\absolutt\sharepointmodernizationscanner\PerformConnectToGroup.ps1:251 char:9
+         Add-PnPOffice365GroupToSite -Url $siteCollectionUrl -Alias $a ...
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : WriteError: (:) [Add-PnPOffice365GroupToSite], ServerException
    + FullyQualifiedErrorId : EXCEPTION,SharePointPnP.PowerShell.Commands.Admin.AddOffice365GroupToSite

Does anyone know why?

Answer 1

This error is occurring because you have not enabled Site classifications.

You need to enable Site Classifications in your tenant to use the classification parameter.

For that, you need to use the PnPSiteClassification command as below:

Connect-PnPOnline -Scopes "Directory.ReadWrite.All"
Enable-PnPSiteClassification -Classifications "High Impact","Low Impact" -
DefaultClassification "Low Impact"

After that, you can use the PnPOffice365GroupToSite command as below:

Add-PnPOffice365GroupToSite -Url "https://tenantname.sharepoint.com/sites/testSite" 
-Alias "classic3grp" -DisplayName 
"My team site group" -IsPublic -Classification "Low Impact"

Reference - Enable-PnPSiteClassification

Add-PnPOffice365GroupToSite

You can always remove Classification parameter as it is optional and your PowerShell script will work without errors, but if you need to classify the site collection, then that above commands are mandatory.