For instance the error I get is:
2020-05-01 14:59:52.889 +08:00 [INF] Performing automated challenge responses (dns-test.theworkpc.com)
2020-05-01 14:59:52.907 +08:00 [INF] DNS: Creating TXT Record '_acme-challenge.dns-test.theworkpc.com' with value 'u3xK4aYNQfW2qOqfqxLl3r9l8ayjqsHkLFcc9YH-t7A', in Zone Id '' using API provider 'Powershell/PoshACME DNS'
2020-05-01 15:00:05.466 +08:00 [ERR] DNS update failed: Powershell/PoshACME DNS :: Error - CmdletInvocationException: {"statusCode":401,"type":"Authentication Exception","message":"Failed."}
at System.Management.Automation.Runspaces.AsyncResult.EndInvoke()
at System.Management.Automation.PowerShell.EndInvoke(IAsyncResult asyncResult)
at Certify.Management.PowerShellManager.InvokePowershell(CertificateRequestResult result, String executionPolicy, String scriptFile, Dictionary`2 parameters, String scriptContent, PowerShell shell) in C:\Work\GIT\certify\src\Certify.Shared\Management\PowerShellManager.cs:line 175
at Certify.Management.PowerShellManager.<RunScript>d__0.MoveNext() in C:\Work\GIT\certify\src\Certify.Shared\Management\PowerShellManager.cs:line 85