Powershell- Exchange Online session not lasting more then 2 minutes with Proxy Option

Hi,

    My exchangeonline session is not longing more then 2 minutes.. I created a session as follows

PS C:\>$sessionOpts=New-PSSessionOption -ProxyAccessType AutoDetect -IdleTimeout 3600000 -OpenTimeout 0

and then created a session as 

PS C:\>$session =New-PSSession -Credential <credentials> -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ -Authentication Basic -AllowRedirection -SessionOption $sessionOpts

After establishing the exchange online session, i was able to import-pssession module. After that if i run any cmdlet like get-mailbox, get-mailuser, i will be getting a window to enter credentials.. when i check the $session it results the following

 Id  Name            ComputerName    State         ConfigurationName     Availability
 --   ----                     ------------           -----         -----------------                     ------------
  1  Session1        pod51053psh.... Broken        Microsoft.Exchange            None

please find the screenshots of the issue. 

A pop window came up after 2 mins of idle. 

Is it a known scenario or not? What is the way of making the session last for more then 10 mins. Please let me know if any furthur information required.

Thanks,

satya