Can't install Exchange Online PowerShell V2 module

Question

I'm trying to enable modern authentication for an O365 tenant, and then instructions say to import the Exchange Online Management module. I don't have that module, so those same instructions say to install it by using

Install-Module -Name ExchangeOnlineManagement -RequiredVersion 2.0.5

But then I get this error

WARNING: Unable to resolve package source 'https://www.powershellgallery.com/api/v2'.
PackageManagement\Install-Package : No match was found for the specified search criteria and module name
'ExchangeOnlineManagement'. Try Get-PSRepository to see all available registered module repositories.
At C:\Program Files\WindowsPowerShell\Modules\PowerShellGet\1.0.0.1\PSModule.psm1:1772 char:21
+ ...          $null = PackageManagement\Install-Package @PSBoundParameters
+                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Microsoft.Power....InstallPackage:InstallPackage) [Install-Package], E
   ception
    + FullyQualifiedErrorId : NoMatchFoundForCriteria,Microsoft.PowerShell.PackageManagement.Cmdlets.InstallPackage

Just in case I did also run this to check

Get-PSRepository

And the result was

Name                      InstallationPolicy   SourceLocation
----                      ------------------   --------------
PSGallery                 Untrusted            https://www.powershellgallery.com/api/v2

And that seems correct. So does anybody know why it's not working.

Thanks!

Answer 1

You may have a problem with TLS: powershell-fix-warning-unable-to-resolve-package-source-https-www-powershellgallery-com-api-v2

Does this work, or do you get an error?

Invoke-WebRequest 'https://www.powershellgallery.com/api/v2/'

Answer 2

You are correct it was a TLS issue in the end. The solution was to force a higher version of TLS using:

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12