Two possible reasons here:
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Discord is blocking Nord from password reset links on a network level (probably because VPN servers are second only to Tor when it comes to malicious traffic). Frankly, I would’ve expected a CAPTCHA page instead, but it’s technically possible for an error to show up that way. You can try bypassing it by manually editing the address to make sure it starts with https.
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Your VPN is actively trying to sslstrip you. Aside from the whole “that’s literally a crime people go to prison for” thing, that means you cannot ever trust that VPN again. Just because Discord bothered to secure their website doesn’t mean other apps do. You may already have been hacked if that is the case.
I’d be extremely cautious with VPN software because you’re essentially trusting them to be your ISP. If they’re doing permanent 40% off deals or (god forbid) sponsoring YouTubers, you should never trust them. It’s both funny and depressing how companies like PIA and Nord somehow convinced everyone that VPNs make your internet more secure while also not getting people to think for even a second about how much they trust these shady ass Caiman Island tax dodge scheme companies.
I don’t believe you can do it natively. However, I have managed to convince my phone to swap from slow 2.4GHz to 5.2GHz by using the Fritz! Wlan app, which exposes some more WiFi control.
I can imagine recent Android versions having patched that out, though. WiFi permissions are usually only granted to system apps these days.
I believe there’s also an ADB command line way, but I don’t remember it. Furthermore, you could try looking into developer options to see if there’s a toggle in there, or perhaps a method to select the WiFi country so you can pick one that won’t connect to your 5.2GHz band.
As long as the SSID and password are the same, and both are routed to the same network, IoT apps shouldn’t struggle to connect, though. You can try temporarily disabling 5.2 GHz in the router but I kind of doubt that it’ll fix your problem unless you have a really uncommon setup. Even with my weird guest network setup, cheap tuya IoT seems to connect just fine. Tuya all goes through the cloud anyway.