Ddns on the local network

Installing and Using OpenWrt
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Hi, all.
Main router #1 (192.168.1.1) NanoPI R5C - OpenWRT 23.05.04 is running as wan and dhcp server, nat is also enabled, port 8090 is open for 192.168.1.180, also on router #1 ddns is configured to domain.ddns.net.
Switch router #2 (192.168.1.2) Xiaomi Mi Router AC2100 - OpenWRT 23.05.04 does not use wan interface and is configured as switch, nat is disabled, Wi-Fi is enabled, cable connected to lan port of main router #1 192.168.1.1. Configured as ‘Dumb’ Access Point.
PC static IP 192.168.1.180 and connected to lan port of router #2 (192.168.1.2).
The PC has no access to ddns from the LAN when querying domain.ddns.net:8090 or any other application port, be it a game server or other programme. If you query 192.168.1.180:8090, everything works and opens.
From outside the internet, when querying domain.ddns.net:8090, access is there and everything works.
I know it's weird to access via ddns on the local network, but originally when I was using 1 router, which is #2, there was no problem and I could access ddns on the local network.
Tried connecting my PC directly to the main router #1 (192.168.1.1) and still no access to domain.ddns.net:8090.
Using nmap it tells me that the port is open.
How can I access ddns (domain.ddns.net:8090) from the local network?

Help me.
Thanks!

port forward 8090

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In DNSMasq you can set the address of domain.ddns.net pointing to the local IP address 192.168.1.1, or you can enable NAT hairpinning:

In the Port Forward > Advanced settings:

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I tried your method. didn't help

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Which one? There were 2 provided.

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I tried everything and it didn't help

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Change the DNS to point the domain name to the correct private address. Then check from a local device what the domain name is resolving to. You might need to clear the DNS cache on whatever device you're testing from.

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Where exactly? Give me a hint

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Where what exactly?

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where do I specify the dns?

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The same place you did it last time. Just delete the entry you added when following @egc's advice and replace it with one that points to the correct internal address.

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Summary

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it worked! Thank you.
Is it possible to implement this via port forwarding?

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