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
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.