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Dear @bruce Weinstein,
Welcome to Microsoft Q&A Forum!
Thanks for reaching out about the issue adding your MS365 Exchange email to your iPhone. Could you please try following the official steps in the article below?
- Open Settings on the iPhone/iPad.
- Scroll down and tap Mail.
- Tap Accounts.
- Tap Add Account.
- Select Microsoft Exchange.
- Enter the email address and a description (anything you like).
- Tap Next.
- Tap Sign In when prompted. (Tap “Configure manually” only if your admin specifically requires server details. Also, I recommend that you should check this one with your IT Admin, that may be a reason of it)
- Enter the password for the account, then tap Sign In or Next.
- When the Mail app requests permissions, tap Accept.
- Choose which items to sync (Mail, Contacts, Calendars, Notes).
- Tap Save.
Reference: Set up an Outlook account on the iOS Mail app
This guide walks through the correct method for adding Microsoft 365, Exchange, or Outlook accounts on iOS and often resolves sign-in or configuration issues.
Also, I found this article that may be related to your case, you can consult as well: https://support.apple.com/en-us/105128
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I hope this information can help you and please feel free to update to me in comment section.
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