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[Solution]
PPPoE via the OPNsense and Zyxel modem has been working for me for a month now without any problems.

This post explains wonderfully how it works: https://www.lteforum.at/mobilfunk/opnsense-hinter-zyxel-vmg4005-50a-ont.21045/#post-411945

The port forward rule on WAN - is the " Filter rule association" field set to "Pass"?

Yes.

The internet connection with PPPoE on the FritzBox AND the opnSense is working fine. I get a public IP directly on the WAN interface of the pfsense.

I tried to set the FritzBox just to PPPoE passthrough *without* login credentials on the fritzbox. But there were just error messages on the opnsense (see first post). I hate the fritzbox btw. I want to configure my router and my internet connection like I want.

So the problem I am facing now is that port forwarding is not working and I am afraid that the FritzBox (..current modem) is the reason. (see screenshot for my port forward settings - should be fine - but not working).

Should I set up a separate modem instead of the fritzbox? How do I configure that? With PPPoE or just "bridge mode". opnSense stays as it is right now?

Thanks for helping me.

What do I have to change with an external Modem (Asus DSL-N16) instead the FritzBox on the opnSense? Do I need the PPPoE credentials just on the opnSense and thats it? Or are there any settings to change on the modem as well?

Great, I will check with my ISP.

Thank you so much! :)

this is in the opnsense. same ip, except the last number

Many thanks to your fast reply. I understand what you mean, so I ordered a real modem.

In the meanwhile I tried something else: On my FritzBox I selected as ISP "Drei" (as it usually was) and it automatically set the PPPoE credentials. But username and pw I got from my ISP (via email) is something slightly different - I set up the PPPoE connection on the opnsense with that(from mail) and voilá it is working. (Internet access through opnsense) - ping and speed is great.

Now my question: Do I still use the NAT and firewall from my fritzbox? Or JUST from my opnsense now? Can I check that?

(the screenshots need to be opened in a sapered tab - dont know why)

Hey guys, I hope you can help me with the following issue:

I got a Fritz!Box 7530ax from my ISP that was my modem, router, access point and switch. Now I only want it to be my modem. OPNSense is working fine with my Fritzbox plugged to my WAN port of course. But I have double NAT, from the fritzbox and the opnsense. And also the firewall on both. Thats not good - I dont want that.
So I got the PPPoE credentials from my ISP ("drei" in austria). I tried it on my fritzbox - works fine. Then I tried it on my opnsense - not working.
I checked "connected network devices may also establish their own internet connection." on the FritzBox (translated from german).

Please take a look at my screenshots. First one is the Fritzbox. Second and third are the config of the WAN on opnsense. Last one are the logs from opnsense.

Thanks for helping me!!

Edit: Solution in last post