Duck DNS from TP link 3g/4g router

Configuration
1

I have two home assistant systems. Both on a Rasberry pi.
One is on my home network. There, DUCK DNS works well.
The other system I want to connect to a TP link router with 3G / 4G sim card in. This system I do not get to work. What do I need to do differently when it connects to a 4G router?

2

Cellular carriers use CGNAT. You cant use DuckDNS with this.

Nabu Casa Remote works over CGNAT. $5 a month and profits help support home assistant development. Webhook Relay’s services cost as much and don’t have this advantage.

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3

Or you use a sim with fixed public Ip. Cheap and reliable

4

If you can get one.