My first question is why are you trying to access a non-Yahoo mail account from the Yahoo mail client? I actually didn't even think that was possible.
FWIW, I use...
Phone - iOS Mail app for Google and Yahoo mail accounts, Outlook for work email
iPad - IPadOS Mail app for the same, no work email here (don't want my iPad on company MDM system)
Mac - MacOS version of Outlook for work email (this is my work laptop)
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