Unable to resolve package source
If you are running an older version of TLS and try to interact with the PowerShell Gallery you may see error messages like:
WARNING: Unable to resolve package source ‘https://www.powershellgallery.com/api/v2’
The gallery officially only supports TLS 1.2, so you have to use this as a workaround:
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
Read more: https://devblogs.microsoft.com/powershell/powershell-gallery-tls-support