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If that’s invalid or you still would like to know more about it, due to here we mainly focus on general issues about Outlook desktop client, we may know little about the outlook account in Apple Mail, in order to solve your issues better, please kindly post a new thread in this forum: I also have researched a lot about your issue and found a thread that mentioned the Office 365 MFA and the Apple Mail app for iOS, please kindly check if it’s also helpful to you. Hi this issue be reproduced on other account? If it only happened to your outlook account, the issue may be related to this account.
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