I have found some problems with SEF urls in Akeeba Subscriptions, i temporary work around the issue by adding
$app = JFactory::getApplication();
$router = $app->getRouter();
$router->setMode(0);
in the file components/com_akeebasubs/router.php in both method
function AkeebasubsBuildRoute(&$query)
{
        $segments = array();

        // workaround to disable SEF
        $app = JFactory::getApplication();
        $router = $app->getRouter();
        $router->setMode(0);
and
function AkeebasubsParseRoute($segments)
{

        // workaround  to disable SEF
        $app = JFactory::getApplication();
        $router = $app->getRouter();
        $router->setMode(0);
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