Questions related to Round 17 : Search for Sita should be posted here.

E. Tapa Guard (Coded)
Is it possible to have multiple digits in an undivided cell?

No, an undivided cell will only contain one letter(number).

Sentinels (coded)
The rules mention shaded cells, but the clue cells are not shaded in the example.

The rules are based on the competition booklet format. The IB has already gone for printing.
Here is the IB puzzle synced to the PB format:
Solving URL: https://tinyurl.com/43jzmkpp
Solution URL:https://tinyurl.com/55amrf39