If you’re stuck in Yahoo Mail issues, then follow the stepsto troubleshoot them:
1. Run a scan on the Yahoo account.
2. Move to the tool of Yahoo MailQuick Fix.
3. Choose the issue you're having.
4. Enter an alternate email address.
5. Then, Enter the shown verificationcode.
6. Click on the Create Request.
Go for
YahooCustomer Service instantly if there’s no improvement in thesituation.
https://www.numbersfor-support.com/yahoo-customer-service-number/