Notifications do not work for the other ID when using multiple IDs
For people with multiple IDs, notifications on the yahoo app are a real pain. If you switch IDs, you only get notifications pertaining to that particular ID which you are currently signed into... So you miss updates on players, chat messages, etc. And even when you switch, you have to manually look for the chats because there is nothing telling you that you missed something while on the other ID. I know this is a somewhat unique thing for people who play a lot of leagues but it's a huge usability issue.
Thank you for this feedback. We do not recommend creating multiple Yahoo IDs to override the maximum leagues per ID. If you attempt to join paid contests with two different IDs you can be blocked and have all contests cancelled.