Creating Dynamc Distribution List using RecipientFilter -like

Data

• Identity: User1, CustomAttribute1: aa
• Identity: User2, CustomAttribute1: aa bb
• Identity: User3, CustomAttribute1: aa bb cc
• Identity: User4, CustomAttribute1: bb cc
• Identity: User5, CustomAttribute1: cc

Above is the data available in my domain. I would like to create a Dynamic Distribution Group to select the users with the CustomAttribute1 contain bb.

I created below Dynamic Distribution Group but no result returned.

New-DynamicDistributionGroup -Name "bb" -RecipientFilter (CustomAttribute1 -like 'bb')

Please help.

Thanks.