I use a Benchmark SPDIF from my GeerFab to the DAC. I used to have the Benchmark DAC3B on this chain and it worked all the time. However, I sold the DAC3B and now have the Schitt Yggi+ OG on this setup. I have not had time to try it out yet. I will give it a shot tonight with the same cable.
The Schitt does not do DSD so I am not sure if it will work, unless it can use DSP over PCM. That is for SACD’s via my very low cost used OPPO.
The GeerFab is a great unit, and it replaced my modded Sony SCD-1 (that died) and it is hard to match the Sony in sound quality. The GeerFab is better than the Sony in some ways, clarity of the newer DACs. Though the modded Sony had a great sound even if it lacked some detail.