Just wanted to say thank you to everyone in the comments. I tried getting the frame tapped at the store, but unfortunately that didn’t work. The proprietary Thru axle doesn’t seem to hold, but a Saris trainer axle manages to catch the threads. Worst case, if the warranty route fails, I’ll use this temporary solution until I can install a helicoil and eventually replace the frame with a Winspace T1550.
It’s a bit of a bummer since I really liked this bike and learned a lot on it.
Still waiting to hear back about the warranty.