editing existing Dynamic Distribution Group or list Exchange Online

We need to edit an existing  Dynamic Distribution Group  in Exchange Online

I need it  to only list User with China  listed for the Country,   and  I am trying to add additional filter  to  filter out Mailboxes with Custom Attribute 1   excludechina   so those mailboxes will not show up in the list recipients.

here is script :

Set-DynamicDistributionGroup -Identity allChinaUsers -RecipientFilter {RecipientType CustomAttribute1 -ne 'excludechina' -and CountryOrRegion -eq "China" -and RecipientType -eq 'UserMailbox'}