Homepage not cached on IIS

[BriNetDev]

I've seen the other topics about homepages not being cached on IIS servers due to using a capital I in index.php but i'm unable to get any homepage caching under IIS. Posts and pages do seem to cache fine. Any suggestions?

web.config is pretty basic:

<directoryBrowse enabled="false" /> <rewrite> <rules> <rule name="WordPress: https://domain.com" 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></rules> </rewrite>