Subdomain add comment redirect to 404 not found page iis server

Solved. Just for completeness I add a rule to the web.config file :

<rule name="WordPress Rule 2" stopProcessing="true">
    <match url="^([_0-9a-zA-Z-]+/)?(wp-comments-post.*)" ignoreCase="false" />
    <action type="Rewrite" url="{R:2}" />
</rule>

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