Resistive touch screen not found

I have a Uno (PID:50) and 2.8 inch TFT Touch Shield with resistive touch. Running the example TouchTest I get a message "STMPE not found". I have tried using option 1 and 2 in the test and have tried a number of values for "STMPE_CS" in option 2.

This is an unmodified 2.8 inch display shield board plugged directly into the Uno. No wires, no changes. Should it work that way? Are there settings/coded changes needed?

Are you following their tutorial? https://learn.adafruit.com/adafruit-2-8-tft-touch-shield-v2

You should be using Option 2 in the TouchTest example. Option 1 is for the I2C interface and the shield uses the SPI interface.

Try the TouchPaint demo to see if that works.