SAML Group Synchronisation

Hi

I'm having some problems with SAML Group Synchronisation, from Azure.

Have successfully set up SSO in our environments and new users are created automatically. However, I can't get the Group Sync to work. I know that one particular group does exist in Azure and am using the ObjectId of this group. I think the problem may be that the groups don't show up in the SAML messages. Am I correct to say that in the SAML messages, there should be a SAML Group attribute, as documented here https://docs.appian.com/suite/help/21.1/SAML_for_Single_Sign-On.html#group-membership-synchronization 

i.e. something like below

<saml2:AttributeStatement>
    <saml2:Attribute Name="member-of" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic">

In my SAML file, the AttributeStatement section contains only attributes related to my user account i.e. displayname, surname etc.

Can anyone confirm?

Thanks.