Modern authentication is disabled in Exchange Online in Office 365 by default. However, you are quite likely to want modern authentication, because modern authentication in Office 365 enables authentication features like multi-factor authentication (MFA) using smart cards, certificate-based authentication, and third-party SAML identity providers.
You can enable modern authentication in Exchange Online via PowerShell. However, I found the article explaining how to enable modern authentication for Exchange Online is missing some detail regarding how to connect to Exchange Online.
For reference, below is a sample script for connecting to Exchange Online
# Capture your credentials to a credential object $UserCredential = Get-Credential # Establish a remote connection to EO in your O365 tenant $Session = New-PSSession -ConfigurationName Microsoft.Exchange ` -ConnectionUri https://outlook.office365.com/powershell-liveid/ ` -Credential $UserCredential -Authentication Basic -AllowRedirection Import-PSSession $Session # Check if modern auth is in place already Get-OrganizationConfig | Format-Table -Auto Name,OAuth* # If modern auth setting is false, then enable it Set-OrganizationConfig -OAuth2ClientProfileEnabled $true # Check again to ensure it comes back as "True" Get-OrganizationConfig | Format-Table -Auto Name,OAuth*
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