MC told clearly in post #19 that DAW mode won't work for that and it failed for me as well, when I tried (tbh never used the limited DAW mode). You would always need a DAW project open and route sound always in the DAW/app with loaded ASIO driver). So please forget about. As you can see normal mode works nicely and routing in TM FX is not rocket science you only need to know once how to do it, thats all.
The instructions for routing in Submix Mode I gave you already and it worked, well done, congrats !
I performed a drawing to make your setup more clear, as it appeared to me that you have maybe understanding problems in terms of clock setup etc ...
Tip: If the image is too tiny, then right click to it and open it in a new browser tab ..
My final advice again, see post #23 above: read my blog article how to get a good 1st time setup and then to watch RME TM FX tutorial videos. If you have that as a basement then maybe reading the very good manual is easier to you.
If you want a DAW mode alike routing in TM FX normal mode as a 1st start, then you only need to use one of the reset mix options: TM FX -> Options -> Reset Mix -> Straight playback. And then refine routing.
Then all SW playbacks (from PC) would be routed to their corresponding HW output, e.g.
SW Playback ADAT 1/2 to HW Output ADAT 1/2
SW Playback ADAT 3/4 to HW Output ADAT 3/4
and so on.
BUT .. I think easier for your setup/use would be
TM FX -> Options -> Reset Mix -> Straight playback with all to Main out-
Then all SW playbacks would be routed to your ADAT 25/26 OUT.
Take care ... before that use ASSIGN button to assign ADAT 25/26OUT to "Main Out", which also brings this channel in the TM FX control room, so that you can use control room features.
Don't forget to save your routing in one of the snapshots 1..8.
Also nice to save your workspace to a 1 of 30 workspace quick select slot, then you recall your setup to the last saved one by pressing ALT-1 (in case you experimented and want to come back quick. You can recall 9 workspaces with ALT-1 .. ALT-9.
Finally save your setup to a file on PC where it is part of your normal system backup.
TM FX -> File -> Save Workspace As...
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub13