May I suggest to get some basics as a refresher to TM FX and routing ..
Sources of information here: https://forum.rme-audio.de/viewtopic.php?id=34394
Another thing. What do you expect from the combination of RayDAT and 802?
It might be easier to use one Recording interface, esp. if your TM FX skills are a bit "rusty".
Ok, the HDSPe driver even allows for 32 samples at single speed but the difference to 48 samples as a minimum for the 802 (older) USB driver is not that big and stability and RTL (round trip latency) with RME USB drivers is on par with PCIe.
To setup both interfaces you should keep both manageable, so to say also install the RME USB driver for the 802 and then you can either open a 2nd instance of TM FX to have TM FX #1 for RayDAT and TM FX #2 for 802.
Then you need to configure the routing step by step.
Lets leave out the control room (assign operation) for a while. It only adds a HW output to the control room to offer control room features, do it last.
First of all you need to configure the routing for both interfaces.
For the RayDAT to send something through ADAT.
For the 802 to route something received through ADAT to be routed to one or more HW outputs (aka "submixes") remember, each HW output in TM FX has its individual routing.
Do not mess up everything with the limited DAW mode, use Full mode and become acquainted to it.
Reason, otherwise you have to route EVERYTHING through the DAW with the Full RTL over USB, there are use cases where you would get unwanted / not needed additional latency.
If I may give you another tip.
Go to matrix view and remove all routings of both interfaces and establish only the needed routings.
By this you will also have an excellent overview in the Matrix view.
If you have many standard routings additionally, then matrix view is IMHO of limited use, you see too much of routings that you will never ever use.
What I mean proposing this, here a real-life example:
https://forum.rme-audio.de/viewtopic.ph … 00#p192400
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub13