LDAP auth to have multiple groupd_dn with Viewer access

I have two LDAP groups a-group-1 & a-group-2 . I want to have both the groups Viewer access to the dashboards .
I tried to have a-group-*, but that does not seem to be working.
Also tried to have two separate entries for group_dn, but that is also not working.

Can someone help me out to have two LDAP groups access Viewer role inn dashboards

–Rahul

Can someone help on this

–Rahul