Office 365 Throttling Policy

The throttling policy for O365 is 10. You cannot increase this but you can view it.
The EWS policy will be set to 10.
Increase each thread by 1 starting at 2. If you go from 2 stright to 10 you will get access errors.

$cred = Get-Credential

$session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ -Credential $cred -Authentication Basic -AllowRedirection

Import-PSSession $session

Get-ThrottlingPolicy | Format-List -Property EWSMaxConcurrency

Remove-PSSession $session

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