No sound from DAC+ DSP and RPi 4B

Installed a new hifiberryos (20210531) for rp4 in a new 32gb kingston MicroSD.
Mounted a brand new RPi4 Model B 4Gb and a brand new DAC+ DSP board.
Everything seems ok and I can access the basic information with hifiberry.local
I connect my iphone to spotify premium , select HIFIberry but I can't get any sound from RCA or SPDIF.
Did not change any parameter. Please advise. Thanks in advance


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