Custom URL rewrite rules on WPNetwork

I have a theme that has some custom rewrite rules built in to it. The problem is that they are not working with WP multisite. On the install I use to build themes (which is outside of the network), it works fine. When I bring the theme into the network, it doesn't work.

**funcitons.php**

add_rewrite_rule('^prop/([^/]*)/?','index.php?pagename=prop&mls=$matches[1]','top');

add_filter('query_vars', 'add_mls');

function add_mls($public_query_vars) {
$public_query_vars[] = 'mls';
return $public_query_vars;
}

**web.config**

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<rewrite>
<rules>
<rule name="WordPress Rule 1" stopProcessing="true">
<match url="^index\.php$" ignoreCase="false" />
<action type="None" />
</rule>
<rule name="WordPress Rule 2" stopProcessing="true">
<match url="^wp-admin$" ignoreCase="false" />
<action type="Redirect" url="wp-admin/" redirectType="Permanent" />
</rule>
<rule name="WordPress Rule 3" stopProcessing="true">
<match url="^" ignoreCase="false" />
<conditions logicalGrouping="MatchAny">
<add input="{REQUEST_FILENAME}" matchType="IsFile" ignoreCase="false" />
<add input="{REQUEST_FILENAME}" matchType="IsDirectory" ignoreCase="false" />
</conditions>
<action type="None" />
</rule>
<rule name="WordPress Rule 4" stopProcessing="true">
<match url="^(wp-(content|admin|includes).*)" ignoreCase="false" />
<action type="Rewrite" url="{R:1}" />
</rule>
<rule name="WordPress Rule 5" stopProcessing="true">
<match url="^([_0-9a-zA-Z-]+/)?(.*\.php)$" ignoreCase="false" />
<action type="Rewrite" url="{R:2}" />
</rule>
<rule name="WordPress Rule 6" stopProcessing="true">
<match url="." ignoreCase="false" />
<action type="Rewrite" url="index.php" />
</rule>
</rules>
</rewrite>
</system.webServer>
</configuration>

Now, the part that I see that is similar, but not identical is "Wordpress Rule 3", where in my test site, it looks like this:

<rule name="wordpress" patternSyntax="Wildcard">
<match url="*"/>
<conditions>
<add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true"/>
<add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true"/>
</conditions>
<action type="Rewrite" url="index.php"/>
</rule>

So I went ahead and added the rule from my dev site to the network--but I still don't get anything. Any pointers?