Stop asking me every day to identify a new device. I sign in from the same device nearly every time. Why can't you remember this device??
Store the device information somewhere you can remember it!
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If you still find that the issue is happening, please see this help page for troubleshooting:
https://help.yahoo.com/kb/new-mail/fix-problems-mail-sln28075.html?impressions=true
Thank you!
Mail Support