@starshaped @sarajw Thank you both! FWIW: the learning curve is steep at first. I also had to use a lot of hints to get the hang of it. (Sometimes still do.)
Most of the time, these situations can be read as "you're close to a deduction on one layer, but you need to look at the other layer to get there."
Here, you have two 2's already filled in, and only two possible ways the remaining twos could go. The number layer alone could go either way, so cross-check it with the color layer. Would you still be able to get every color of 2 on the board both ways?