My email account got locked while traveling abroad on Jan 1, 2018. I contacted both Yahoo and Verizon customer support but have not been able to resolve this issue. I believe that my yahoo email account is served by Verizon as attempts to unlock the account from Yahoo site always takes me to Verizon login page. Unfortunately, the Verizon site has no means to proceed with account unlock after yahoo texted security key to reset the email account.
I found several forum users had similar Verizon/yahoo email issue since 12/17/17. My first contat with Verizon Customer Service on Jan 2nd had confirmed my yahoo email was served by Verizon via remote desktop to my PC but he was not able to fix it and asked me to contact Yahoo. Unfortunately Yahoo Customer Service repeatedly instructed me to contact Verizon for my email issue. Its web page to reset password or unlock account continue to display both Verizon and Yahoo logo.
I tried contacting Verzion Customer Service again on Jan 12th but unfortunately still resolve this issue. Your help to resolve this issue is greatly appreciated as this yahoo email account was by primay email for past 20 years.