Are you able to see your iPhone's hotspot when looking for hotspots to connect to?
I'm able to connect my phone to the BlackVue access point but I can't even see my iPhone's hotspot when I try to connect the cam to some other wi-fi hotspot - I can see a bunch of wi-fi in the area but I haven't tried to connect to anything but my iPhone.
Are you on the latest software 1.006?
It seems to have some bugs with cloud connection, so it may be related to that.