Troubleshooting.
Three things that come up a lot, and what actually tends to fix them. None of this means it is not going to work, most of it is just the next thing to try.
01
Won't go near it
Move the board to wherever they already spend time, rather than a new spot, and stop loading the tray for a few days. Let them investigate it on their own schedule with no expectation attached. A board that only appears at training time can read as a test rather than furniture.
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A dog sniffing at the board and walking away without scratching.
02
Only wants the tray
If a dog is working the tray loose with a paw or nose instead of scratching the surface, the board may be too easy to tip or shift under them. Confirm it is sitting flat and steady, and check that the tray is seated fully in the back rather than left partway out.
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A dog with a paw braced on the edge of the board, working the tray loose.
03
Scratches once, then stops
A few seconds of scratching followed by checking in with the handler is normal early on, not a sign of losing interest. End the session there and reward what happened, rather than waiting for more. Sessions that get stretched past what the dog offers tend to shrink the next day, not grow.
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A dog scratching briefly, then stopping and looking to the handler.
Still nothing after a week
Some dogs need front paw work broken into smaller pieces before any of this applies. Start over with the getting started guide, and if hind paws specifically are the stall, that is a separate skill covered inback paws.