Caddy not passing header to upstream

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You should use handle instead here, so that once you’ve stripped the path prefix, you don’t need to rely on a matcher afterwards for reverse_proxy.

handle /app* {
    uri /app/_next* strip_prefix /app
    reverse_proxy {$ELB_HOST} {
        header_up +codomain {host}
        header_up +service admin-ui
    }
}

Also if you use handle for one route, I recommend using it for all routes. It’s helpful to keep routes mutually exclusive (so if one is matched, other handle are not run - use one without a matcher as a fallback)

Some additional reading:

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