Just keep in mind that is very unlikely that you will be allowed to stay at the store you’re training at. The store you were hired at has a labor gap, and they’re waiting on you to finish your training so you can help them fill that gap. The manager of the store you’re training at agreed to do your manager a favor by training you. It’s very unlikely that they’re going to turn around and take you from a coworker in need during the busiest time of the year and force them through the interview / hiring / training process again.

I would just ask someone from there for the managers number or if they could message the manager themselves with your number and have the manager get back to you