No. It's because Yahoo's mail servers are pretty much garbage and often get out of sync. You can't control which of their servers you will get when you attempt to log in. If the server you hit is borked, it will reject your credentials.
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So my iPhone can keep me logged in my account but I cannot access it on another device for some reason. I don't use my iPhone anymore and I don't think I changed the password but when I try to log in on yahoo.com or the app that came with the phone it tells me wrong password do you have any idea why it would do that.
Question: Email log in question