Hello,

I have this router and I'm struggling to get the settings correct.

I have refered to this page

https://www.dynu.com/DynamicDNS/IPUpdateClient/DrayTek-dynamic-DNS

I have set the Service Providor to User-Defined as ther's not an option as shown in the example page of Customized

Provider Host "api.dynu.com"

Service API "api.dynu.com/nic/update?hostname=qlx.dynu.com&password=XXXXXXXXX"

I've checked that the password is correct that I set in Manage Credentials page

Try only "/nic/update?hostname=qlx.dynu.com&password=XXXXXXXXX" in the Service API field.