Hello Dilys
Thanks for your post. From what you described, your Hotmail account get locked after a few sign‑in attempts on a new iPhone, even though the account is still accessible on your old iPhone. I understand how frustrating it is when the recovery form keeps being rejected multiple times.
I can see that Q&A Assist has already shared the standard recovery and unblock steps. Have you already tried those steps yet? Just to clarify, are you accessing the account on your iPhone using the Apple Mail app, or the Outlook mobile app?
In the meantime, here's what you can try next:
1, Use the trusted device (your old iPhone that still has access) to review and update security information if possible:
- Go to https://account.microsoft.com/security > Manage how I sign in
- Add a new way to sign in or verify that you can access now
- Official guide: Microsoft account security info & verification codes - Microsoft Support
2, Fill out the Microsoft Account Recovery form (ACSR) one more time with maximum details
- Wait at least 24–48 hours before submitting the recovery form again.
- If the recovery form is being rejected, please avoid sending the same details repeatedly, try to provide the most accurate information you can.
- Please see this official guide to help you fill out the form more accurately: Help with the Microsoft account recovery form - Microsoft Support
Looking forward to your reply so I can guide you with the correct next steps. Thank you for your understanding!
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