Hi @Favia_Adolfo,
Thank you for your patience in awaiting a reply.
It looks like the HDMI connection to the Nucleus is the culprit here.
Nucleus (and most anything connected via HDMI) is limited to 192.
From Wiki:
For digital audio, if an HDMI device has audio, it is required to implement the baseline format: stereo (uncompressed) PCM. Other formats are optional, with HDMI allowing up to 8 channels of uncompressed audio at sample sizes of 16 bits, 20 bits, or 24 bits, with sample rates of 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, or 192 kHz.