I'm also experiencing the same Tidal error. Even when setting to 16/44, the app isn't happy.
Since the DACport HD doesn't do MQA, I have Exclusive Mode and Force Volume checked. With software processing MQA, should get 24/96 so I set my DACport to 32/96 for now.
I started seeing the error after selecting Exclusive mode. Tidal settings for "Sound Output" also doesn't persist w/ exclusive mode. It'll change from "CEntrance USB Audio" to "System Default" no matter what I do. I think this is the cause of the 16/44 error.
Regarding the DACport settings, looked at the back of the DACport HD box. On there it says:
Sample Rate: up to 384 kHz, DSD128
Resolution: 32-bit (Also supports 16-bit)
Looks like there may have been a specifications change at some point. Potentially 24-bit is not a option with the DACport HD.