O365 Migration Tool Problem - Not able to open Runspace (4373043)

O365 Migration Tool Problem - Not able to open Runspace

O365 Migration tool not connecting to O365. Not able to open Runspace. Please verify target server connection parameters.

O365 tenant not registered in MAM Addressbook Manager

or 

Wrong version of PowerShell module installed:  ExchangeOnlineManagement 

Run PowerShell on MAM server (or the machine you are running the Migration Tool from) as Administrator.
Run following command:

Uninstall-Module ExchangeOnlineManagement


Check there are no left-overs for EOM using command:

Get-Module

Repeat he same by running 32-bit version of PowerShell (run as Admin)



Run the following command again:

Uninstall-Module ExchangeOnlineManagement

Close the PowerShell (reboot the machine you are running the tool from) and run O365 Migration tool as Admin and connect again.
Tool will now install the required version of ExchangeOnlineManagement on background.
This may take several seconds