invoke-expression "Set-DynamicDistributionGroup 'DDLgourpname' -RecipientFilter {(database -eq '$DBDN' -and RecipientType -eq 'UserMailbox')}"
this can resolve the issue.
invoke-expression "Set-DynamicDistributionGroup 'DDLgourpname' -RecipientFilter {(database -eq '$DBDN' -and RecipientType -eq 'UserMailbox')}"
this can resolve the issue.