I seem to be having the same problem, except my phone is a Samsung Galaxy S8.
When I tried to set up my sprocket for the first time, it successfully connects (green tick) but stays stuck/loading on the pairing stage. I can't seem to get past this stage and my sprocket remains unconnected/unpaired.
I have tried resetting both my phone and the sprocket but the same issue still persists.
Any help would be appreciated!