I'm so sorry to hear that you're having issues grouping the speakers in party mode. Stereo and Party mode will not work if both speakers you want to use are powered on and connected to the Bluetooth device. Let's try, in the Bluetooth settings of the device, find the list of previously-connected speakers and headphones. Find your speakers on this list and remove them. Many devices have an option to 'Forget or Unpair' items on the list. If your product appears more than once in the list, remove each instance. After, try again to connect the device to your product.