Alright, so I'm pretty sure it IS a DNS issue. Specifically a IPv6 DNS issue.I disabled IPv6 on my router and restarted my phone but my phone still has an IPv6 IP address and the issue with the app exists.

https://help.nextcloud.com/t/android-app-could-not-find-host-via-url/137387?_escaped_fragment_=

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I don't get why you would make an android app that relies on DNS but doesn't rollback to IPv4. It seems like if you let the OS do what it wants then it would just work. At least that's how all other apps seem to work for me. This is the only problem app.