From ZWO support:
turn on airplane mode on the Iphone
then turn on WiFI and Bluetooth
and then try reconnect
there is a a funny bug on the IOS right now that is causing some upsets with direct connects
try that
when it comes to authentication once you get to the authenticate screen - swap you device wifi to an internet connection then press authenticate .... then swap back to Seestar
see if that fixes the issue
thanks
Simon