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For troubleshooting the issue: Are you able to ping the DDNS address that you are using.
If you are able to ping the address then you will need to allow remote access to the router:
Follow the link: https://wiki.teltonika-networks.com/view/RUTX_Noip.com_DDNS_configuration#Results
If you are not able to ping the DDNS make sure the configurations are correct and you are getting the same WAN IP on no-ip.com and the router's WAN interface. Both IPs should be the same, and public IP addresses.
No-IP interface shows whether the DDNS is active or not. Does it say Active? if yes what IP does it shows?