This is ready for iOS and Android Login/Logout/Vanish and Create Account events - however there are some pending questions in HCaptcha logging section that needs to be hammered out with engineering input.
Android and iOS Authentication Data Instrumentation Planning T417470
@SNowick_WMF I have a couple of Experimental builds kicked off with my work, if you could do a little bit of early testing to ensure events are being received and looking good, we would appreciate it!
TestFlight Experimental 7.9.3 (310)
This will be what gets merged. It let's HCaptcha do its thing, which means for a real users it's not likely to challenge.
TestFlight Experimental 7.9.3 (311)
This build forces an HCaptcha API key that always challenges the user. It also fakes a success flow when the user completes the HCaptcha challenge (without faking this key would cause a server-side error).