what can i do , I Can't get any useful information in the error message

[fschenkun22]

[2022-05-18_15:23:03] Failed updating IPv6 host address
  This could be caused by many things, including:
  the dynv6.com service being down,, irresponsive, or malfuctioning,
  no reachable Internet route (via IPv6) to the https://dynv6.com service,
  a wrong or invalid value for <host>,
  or a wrong or invalid value for <token>.

[linxin2020]

I also encountered the same problem. Now I confirm that it is not the call problem, but the project problem; This project has not been maintained for too long, and the dynv6 API has changed.

[zen010101]

update the dynephant.au3 file:

Func UpdateDynv6HostRecord($dynv6Host, $dynv6Token, $ipVersion = 6)
	; construct URL with payload for dynv6 update
	$dynv6Protocol = "https"
	$dynv6ServerBase = "dynv6.com/api/update"
	; hosts issued by dynv6.com are on the dynv6.net 2nd level domain!
	$dynv6HostSuffix = "dynv6.net" ; "dynv6.net" is the only valid value (for now)
	$dynv6HostFqdn = $dynv6Host & "." & $dynv6HostSuffix
	If $ipVersion = 4 Then
		$dynv6ServerPrefix = "ipv4."
		$dynv6IpString = "ipv4=auto"
	Else
		; no fancy errors for invalid $ipVersion, just assume 6
		;$dynv6ServerPrefix = "ipv6."
		$dynv6ServerPrefix = ""
		$dynv6IpString = "ipv6=auto"
	EndIf
	$dynv6Url = $dynv6Protocol & "://" & $dynv6ServerPrefix & $dynv6ServerBase
	;$dynv6Url = $dynv6Protocol & "://" & $dynv6ServerBase
	$dynv6Url &= "?" & "hostname=" & $dynv6HostFqdn ; TODO: URL Encoding
	$dynv6Url &= "&" & $dynv6IpString
	$dynv6Url &= "&" & "token=" & $dynv6Token ; TODO: URL Encoding
	;ConsoleWriteError("$dynv6Url=" & $dynv6Url & @LF)
	$dynv6UpdateResultBinary = InetRead($dynv6Url, $INET_FORCERELOAD)
	If Not @error Then
		$dynv6UpdateResultString = BinaryToString($dynv6UpdateResultBinary)
		;ConsoleWriteError("$dynv6UpdateResultBinary=" & $dynv6UpdateResultBinary & @LF)
		;ConsoleWriteError("$dynv6UpdateResultString=" & $dynv6UpdateResultString & @LF)
		If ($dynv6UpdateResultString == ("addresses updated")) Or ($dynv6UpdateResultString == ("addresses unchanged")) Then
			; this will actually trigger - "host updated\n" may be returned
			; with the HTTP status code 200
			;ConsoleWriteError("It Worked! - " & $dynv6UpdateResultString)
			Return 0
		ElseIf $dynv6UpdateResultString == ("invalid host") Then
			; this will never happen - "invalid host\n" may be returned
			; but the HTTP status code returned will be 404 (Not Found)
			; resulting in an InetRead error instead
			;ConsoleWriteError("It Failed! - " & $dynv6UpdateResultString & @LF)
			Return 1
		ElseIf $dynv6UpdateResultString == ("invalid authentication_token") Then
			; this will never happen - "invalid authentication_token\n" may be returned
			; but the HTTP status code returned will be 401 (Unauthorized)
			; resulting in an InetRead error instead
			;ConsoleWriteError("It Failed! - " & $dynv6UpdateResultString & @LF)
			Return 1
		Else
			; this might never happen - some unknown string may be returned
			; but the HTTP status code returned may be 4xx (Error)
			; resulting in an InetRead error instead
			;ConsoleWriteError("Wha??????! - " & $dynv6UpdateResultString & @LF)
			Return 1
		EndIf
	Else
		; an InetRead error may be returned for a bad URL,
		; any HTTP status code that is an error, or
		; any other reason that the client is unable to reach the server
		;ConsoleWriteError("InetRead Error! Bytes Downloaded: " & @extended & @LF)
		Return 1
	EndIf
EndFunc   ;==>UpdateDynv6HostRecord

[zen010101]

or you can use powershell script:

$intervalSeconds = 60
$apiUrl = "https://dynv6.com/api/update?hostname=mechrevo16.dynv6.net&ipv6=HERE_IS_YOUR_TOKEN"

while ($true) {
    $response = Invoke-RestMethod -Uri $apiUrl
    Write-Host $response
    Start-Sleep -Seconds $intervalSeconds
}