I have read that in some cases you have to disable any security you have before setting up an Extender, I am not sure if this applies to yours. Personally I would post this problem if you have not already solved it in the Networking Forum of PCA.
Hands-on: Samsung Galaxy S8 review
1995-2015: How technology has changed the world in 20 years
Samsung's beautifully designed Galaxy S8 makes for better VR experiences too
47 iPhone camera tips to help you take better photos
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.