Continual errors trying to use third party apps with this Frankenstein situation between Xfinity and Yahoo

Your forced Comcast.net → Yahoo Mail migration has turned my inbox into a 17,000‑email dumpster fire. I’ve wasted hours trying to clean it using Yahoo‑compatible tools like Clean Email, only to get `NO [AUTHENTICATIONFAILED]` errors despite using a fresh Yahoo app password and the correct `imap.mail.yahoo.com:993` settings. On top of that, connect.xfinity.com spits back “A required service is temporarily unavailable (SRV‑0001),” so I can’t even access my settings to toggle third‑party access. This is unacceptable. I’m a business owner who needs my email to work—not be a daily headache. Fix this now:
1. Resolve whatever backend [Edited: "Language"] is causing SRV‑0001 and blocking IMAP/app‑password access on my migrated Comcast.net account.
2. Confirm third‑party email programs are enabled for my address.
3. Send me clear, working instructions for inbox‑cleanup apps with a Comcast‑on‑Yahoo mailbox.  
I didn’t sign up for this migration, and I expect my email to function as well as it did before—or better. Do not make me escalate this further.