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Ronnie Alstrup Ziegler

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Enable basic authentication for Office 365 account

Hi,

I'm using a Office 365 account in our phone system to access all users Exchange calendar, but after Microsoft Security Defaults have been enabled, it's no longer working. I'm getting this message:

the OIP cannot successfully connect to the Exchange Server.

2020-03-16 15:06:03:142 22  >   Microsoft Exchange version:        EXCHANGE_2016
2020-03-16 15:06:03:142 22  >   Microsoft Exchange server address: outlook.office365.com
2020-03-16 15:06:03:142 22  >   Domain:                          
2020-03-16 15:06:03:142 22  >   User name:                         XXX@XXX.XX
2020-03-16 15:06:03:142 22  >   Notification interval:             5s
2020-03-16 15:06:03:142 22  >   ------------------------------------------------------------
2020-03-16 15:06:03:142 22  >   Calendar synchronization:          yes
2020-03-16 15:06:03:142 22  >   E-mail synchronization:            no
2020-03-16 15:06:03:142 22  >   Private contacts synchronization:  yes
2020-03-16 15:06:03:142 22  >   Public contacts synchronization:   no
2020-03-16 15:06:03:142 22  >   ------------------------------------------------------------
2020-03-16 15:06:03:142 22  >   Primary phone mapping:             Company Main Phone
2020-03-16 15:06:03:142 22  >   ============================================================
2020-03-16 15:06:05:783 195  >   ExchUser.DoNotification(): Connection to server still NOK (wrong user name or password?): Unauthorized !!!!!!!!!!!!!!!!!!!!
2020-03-16 15:06:05:783 195  >   ExchUser.DoNotification(): Check connection to server again !!!!!!!!!!!!!!!!!!!!

This may have the following reasons:
- Incorrect User or password
- Domain name cannot be determined, or is incorrectly specified.
- The user has no impersonation rights   --> see on the online help OIP
- Basic authentication in Exchange Online was not activated   -->

I've reset the password and can login to the office portal with the account. I've tried creating a app password and use this, but with no luck. How can I enable basic authentication for just this one account in Office 365?

Thanks,
Ronnie
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Hayes Jupe
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You cannot, security defaults are not customizable and the restrictions they enforce apply to all users. If you have Azure AD Premium licenses, disable security defaults and configure a matching CA policy instead, excluding said account.