Depending on your PowerShell and .NET Framework version and update, the default security protocol for secure web connections may still be SSL3. You can easily find out:
If the protocol returned does not contain Tls12, you may not be able to connect to secure web services and websites using PowerShell. Simply enable more protocols like this:
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Ssl3 -bor [Net.SecurityProtocolType]::Tls -bor [Net.SecurityProtocolType]::Tls11 -bor [Net.SecurityProtocolType]::Tls12 [Net.ServicePointManager]::SecurityProtocol
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