Wait and wait and wait

Old posts are submitted for archival within a few hours of installing the plugin (new submissions are rate-limited). New posts are submitted for archival 12 hours after publication.

After submission, it can take days, weeks, or even months before a site is made available in the Wayback Machine. There is no guarantee that your site will be made available either — they exclude some type of content, like spam and adult entertainment. That is entirely up to the Internet Archive. This extension simply sends a request to the Internet Archive to let them know you have a new page and would like them to archive it for you.

function wppaiapi_archive_post( $ID, $url, $on_publish ) {
    // verify that the post is still public and a link.
    if ( get_post_status( $ID ) != 'publish' || strpos( $url, 'http' ) === FALSE )
        return FALSE;

could it be that your extension at https: // does not work?

• This reply was modified 6 years, 11 months ago by andrebraselmann.

That works just fine. The position of the substring http in both https and http is 0. strpos only returns FALSE if the substring isn’t in the subject.