How to set up DDNS for gray IP addresses on MikroTik?

Question

Mikrotik

The provider uses NAT and issues "gray" dynamic IP addresses for the PPPoE interface. A VPN tunnel between MikroTiks is organized in the provider's internal network, but when PPPoE interfaces are reconnected, the IP addresses of the interfaces change and you have to manually specify the address of the VPN server.
MikroTik Cloud is not suitable, as it returns the provider's "white" IP address.
The NoIP service in the terms of use prohibits the use of "gray" IPs, and accounts are blocked for violations.
Is there any DDNS service that allows using MikroTik and "gray" IPs, or some other way to automate the configuration of vpn connections in the provider's network?

Answer 1

I see only the option of raising my ddns somewhere outside, from which addresses will be drawn. Or the same scheme, but without a full-fledged ddns, just a file / service that will give the VPN server IP.
Accordingly, update the address using the Mikrotik itself, which acts as a VPN server.
PS Maybe there is an opportunity to talk with the provider about the allocation of one static (but gray) IP for the VPN server?