I was just working on integrating MyWhoosh via mywhooshInfo with my Intervals Companion app, to sync MyWhoosh activities via intervals.icu to Apple Health.
Today I noticed this banner on mywhooshinfo.com:
We are truly sorry but most of the cool new features (such as login, your own segment times, workout builder, intervals.icu integration) had to be turned off and we cannot, unfortunately, say if and when they will be turned back on.