How do I control teleport control?
Solution 1:
Normally when you teleport while wearing a ring of teleport control, when the teleport activates a few turns later, it gives you a box similar to the examine box, which allows you to choose where you'll land. However, I checked your morgue file, and the thin bone amulet you were wearing was an unidentified Amulet of Stasis. If you had been watching your message log when you read the teleport scroll, you would have seen the message:
You feel a sense of stasis.
The Stasis effect prevents teleportation from any source, and thus caused your teleport to fail.