Individual account stuck on my.ent.1password.com: Muse fails with "client_id is invalid", support unresponsive

My Individual account (billed to me personally) is hosted on my.ent.1password.com because a former employer originally set it up. Signing in at my.1password.com says the account doesn't exist.

Connecting 1Password to Muse fails at authorization with "Unable to authorize. [invalid_argument] client_id is invalid", Error Code 3 (Oct 29 and Nov 4, 2026, 1Password for Mac and iOS). The 1Password for Agents docs say only individual and family accounts on 1Password.com are supported, so I believe the ent server is the cause.

Questions:

1. Has anyone had 1Password move an Individual account off the ent server, or is creating a new 1Password.com account and duplicating items the only route?
2. For about 1,200 items, what does not copy cleanly between accounts (passkeys, attachments, custom icons, archived items)?
3. Can unused paid time be credited to the new account?

Support has been extremely slow: tickets 823990 and 871524 have had no human reply since Oct 15 despite follow-ups on Oct 29 and Nov 3. Any pointers from staff or anyone who has done this would be appreciated.