Bose s1 pro to connect with app on n Huwaei p20 pro

I am having endless trouble to connect both speaker with the app in party mode. Then i am getting it right and then i dont., resentl;y uninstall the app and clear the speakers of all paired devices. Its i a real struggle to connect the two in party mode,  then it work and then it dont. Why man why

i have two s1 pro speakers all with updated firmware