Is the account unavailable due to Yahoo Temporary Error 15?
Yeah, sometimes Yahoo Temporary Error 15 unavailable your account. So, in this scenario, you must turn off your device (laptop/ desktop) and then turn it on after a few seconds. You may experience that the restart process mostly resolve issues easily. For further queries, stay in touch with the support team. https://customer-servicephonenumber.com/blog/fix-yahoo-mail-problems-error-15/