The app hasn't been updated in a while, and the server changes are breaking up features. So unless the dev comes back and update the app, this stuff will remain broken.
Last update was in March 2024, more than a year ago. I've switched to Summit at least for now, maybe forever. Seems to be more actively developed, and is somewhat similar to the feel of Sync (though it's much younger, so not on the same level as Sync would be if it were kept up to date).
I used sync up until about six months ago. Using Thunder now.
I appreciate the years of service and have no regrets for all the payments I've made, however it's time to move on. Malicious or not, the result is the same and the app is outdated and broken and there are far better options.