make sure you have the kafka policy create in Ranger, it is not created automatically as part of Atlas installation and need to be done manually.
User: atlas, Privileges: Consume, Create
Group: public, Privileges: Publish, Create
User: atlas, Privileges: Publish, Create
Group: public, Privileges: Consume, Create
Also check HBase policy and make sure you see 2 policies for atlas-titan and ATLAS_ENTITY_AUDIT_EVENTS table (these should get create automatically).
Once the policies are in place, hbase, kafka, ranger and atlas. You should have it in Ranger.