Account deletion
Do not delete accounts that are still in use,even if they haven't been used for years.
My account was deleted,now i can't sign in on any platform it was used for.
-Great job

Hello there.
Depending on your account’s history, it’s possible for it to be removed from Yahoo and become inaccessible. You can always sign up for a new Yahoo Account, but keep in mind that your old Yahoo ID won’t be available for you to use. These actions can result in an account being deleted:
You requested that your account be deleted.
You haven’t signed into your account within the last 12 months.
Your account was used in a way that violates our Terms of Service.
More info here: https://help.yahoo.com/kb/SLN3057.html