RUT901 ddns with noip.com

Hello support,
I have a Rut901 with firmware 7.13.1. I have been trying to get ddns to work for hours (days). I use noip.com. The Rut 901 is only connected to the internet via mobile, i.e. SIM card. All setups and your wiki suggestion don’t work. The noip address is an a account, i.e. only IPv4. I would prefer AAA but that only works with a script. It would be nice if A worked. Why can’t the update URLs from noip be integrated? An error message always appears. What setting do I have to make if the connection to the internet is via a SIM card?
MFG
Netpass

Die ip adresse wird nun von no-ip geholt aber der router übernimmt sie nicht! Er lässt sch von einem anderen rechner nicht anpingen!

I have plenty of devices successfully configured for DDNS with a no-IP address, are you able to share an example of your configuration in the Dynamic DNS settings page? I’ve got a brief example here

Hello,

Could you please clarify which error messages appear?

Additionally, as amadgwick mentioned, it would be helpful if you could share a screenshot of your DDNS configuration.

Best regards,