Cloudflare DDNS update request no longer valid

[Ritmo2k]

I have used DDNS with Cloudflare for some time but recently updates are failing with the following log entry:

/services_dyndns_edit.php: phpDynDNS (int): PAYLOAD: {"success":false,"errors":[{"code":6003,"message":"Invalid request headers","error_chain":[{"code":6103,"message":"Invalid format for X-Auth-Key header"}]}],"messages":[],"result":null}

The only instance of "X-Auth-Key" is in dyndns.class and the headers look correct as per make-api-calls.

I have three configurations that use the same key and two are working.

I removed and recreated the broken instance without luck.

Does anyone know what else to check?

[Gertjan]

@Ritmo2k

I did some heavy lifting for you : Click on the image :

Now look up what might apply to you.
From what I've found : credentials wrong (even after x times checked), pfSense not updated, or, some other issue on the cloudflare side.

[Ritmo2k]

@Gertjan My bad, I am sorry.

I did search but I didn't notice the default is to search by titles only.

Thanks for the nudge.