Be aware that you only get 7.1 sound from 7.1 sound sources - these are a bit rare.
Regarding your two speakers not working in the tests, ensure that you have Windows and your sound system set up for 7.1 sound and not the more usual 5.1
Surface Pro 5 News - release date, UK price, features, specs
Animator Emanuele Kabu’s psychedelic video is a stunning tribute to Lisbon city
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.