How to Enable Basic Authentication Office 365

Modern Authentication is enabled by default in Office 365. Modern Authentication in Office 365 is a combination of authentication and authorization methods. It’s more secure than the Basic Authentication method, which relied only on a username and password. There are some situations, you may want to enable basic Authentication.

There are Mutiple options to enabling basic authentication in Office 365.

Option 1: Enable the organization Basic Authentication from Office 365

1. Login the Microsoft 365 Admin Center
2. Expand Settings and click on Org Settings

3. Select Modern authentication

4. Under Allow access to basic authentication, check Authenticated SMTP.

5. Click on Save

Option 2: Enable the organization Basic Authentication using PowerShell

1. Run PowerShell as administrator.
2. Connect to Exchange Online PowerShell by running the following command:

Import-Module ExchangeOnlineManagement

Connect-ExchangeOnline -UserPrincipalName [-ShowBanner:$false] [-ExchangeEnvironmentName ] [-DelegatedOrganization ] [-PSSessionOption $ProxyOptions]

For example:

Connect-ExchangeOnline -UserPrincipalName blin@blin

3. Enable Modern Authentication use this command:

Set-OrganizationConfig -OAuth2ClientProfileEnabled $true

Note: To verify that the change you just made took place:

Get-OrganizationConfig | Format-Table -Auto Name,OAuth*