Cannot get new Soundcore Motion + to sync to my other one

I’ve been working on this for hours, can’t get them to sync. I can connect either speaker to my device via bluetooth, but not together. I’ve read all the instructions and tried everything I’ve read and can’t fix it. Guess I’ll send it back. Someone stole one of my other ones that worked and I ordered a new one but I can send it back and possibly find something that works better if there is no fix.