SpeakerPhat - unresponsive - is it comaptible with Touchscreen?

There’s no conflict with the touchscreen I’m aware of and, unfortunately, no way for the Pi to “see” the Speaker pHAT in any meaningful way. i2s audio is write-only- a software configuration that outputs a digital audio signal on the right pins. The Pi side of things doesn’t care if there’s a DAC even connected!

My guess is soldering- did you use a hammer header, or solder? Could you post a photo of your pHAT?