How to manual refresh the DDNS resolving address through remote access?

Technical Support for Routers
1

Model No.: GL-MT300N-V2
Software version: 3.102

I have not in touch with the router since I am working from home now, I know the address through goodcloud.xyz, but the result by ping myddns.glddns.com and dslookup myddns.glddns.com 8.8.8.8, I can refresh the DDNS after disabling and enabling the DDNS service but the enabling part need to perform by my colleague, so I need a method to refresh the DDNS resolving address without enabling/ disabling the DDNS service.

Editing the Host file is not preferred.

2

As you know the IP address of the router, can you just use the IP without ddns?

3

Some part of my process setting need to use fixed address, thus I need to have DDNS address instead of IP.