Can't access Home Assistant via extended WiFi network

Configuration
21

Same issue

22

Fixed,
the issue was with something called NAT Lookback. I’m a networking noob so can’t really explain it. But it was fixed by installing a dns server on my home assistant and changing my router’s primary DNS server to the home assistant.
That was following instructions here Home Assistant Remote Access for FREE - DuckDNS + LetsEncrypt + Single URL - YouTube starting 10:29

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