Scenario: We just discovered that our Exchange Online Mangement tools were no longer connecting. When we would run connect-exchangeonline we would receive an error message stating something similar to: ResourceUnavailable: (:) [New-ExoPSSession]
After investigation, we saw that the ExchangeOnlineManagment module was an older module, so we decided to try to update the module. When we ran this command Update-Module ExchangeOnlineManagment we ran into this Error:
PackageManagement\Install-Package : Unable to find repository ‘https://www.powershellgallery.com/api/v2’. Use Get-PSRepository to see all available repositories.
Solution: In order to fix this, I had to register and trust the PSGallery repository, and then I was successful with funning this module:
[Net.ServicePointManager]::SecurityProtocol = [Net.ServicePointManager]::SecurityProtocol -bor [Net.SecurityProtocolType]::Tls12
Register-PSRepository -Default -Verbose
Set-PSRepository -Name "PSGallery" -InstallationPolicy Trusted
Update-Module ExchangeOnlineManagement
Ex-Shell 