Make Email Work Properly with Yahoo Groups
On Android, if you receive a group message summary in your inbox and click "visit your group", you are not taken to your group as signed in. You cannot, for example, view all conversations. A new sign-in is require, even though you are already signed in for email.
Maybe this is partly because there is no Yahoo Groups app and the groups rely on browser pages.

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Glynis Oliver commented
I just want yahoo to work with Thunderbird - tried the app for signing in, wouldn't work, so reset back to password, also renewed password, now can't use yahoo with Thunderbird at all, and no way to contact yahoo to try and get it sorted!! BT now uses yahoo and won't 'converse' with Thunderbird either. Going off yahoo rapidly!!