Forum Discussion

MatoBoost's avatar
MatoBoost
Tin Contributor
Jul 02, 2026

New Outlook: "Changing the ImapRemoteServerInfo is not allowed" after host migration

Hi everyone! I've migrated my domain/mailbox from one IMAP host to another in May. It cannot be added to New Outlook for Windows — fails instantly with INVALID_CREDENTIALS INTERACTION_REQUIRED, even...
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AndryMahefa's avatar
AndryMahefa
Copper Contributor
Oct 19, 2026

Hello RobertSparnaaij​,

I am facing the exact same host migration lockout issue with a client's mailbox.

We recently migrated to Hostinger, and New Outlook for Windows throws a 400 Bad Request: "Changing the ImapRemoteServerInfo is not allowed."

I have already attempted the "Remove from all devices" method, but the server-side cache remains completely locked to the old IMAP host. Local troubleshooting across multiple PCs has been exhausted, and Microsoft Windows Support confirmed the server-side database block under Case Number 7110532601 before referring us here.

I am sending you a Private Message right now with the affected email address and the full DevTools error payload. I would greatly appreciate it if you could assist us in requesting a backend cache flush for this mailbox.

Thank you!