https://mail.yahoo.com/c/n/?reason=n8_cloud

I can sign in to my Yahoo account (ionutbogdangagea@yahoo.com) on any device without any issues, but I cannot access Yahoo Mail on any device or browser.
The inbox does not load and always shows the same temporary error, both in web browsers and in the Yahoo Mail app.
I have already tried all recommended troubleshooting steps: restarting the browser, clearing cache, using different supported browsers, signing out from all devices, and reinstalling the Yahoo Mail app.
The problem still persists across all devices.
Please investigate this issue on the server side, as it seems related to my mailbox rather than my login.