"Add to contact list" stop working after enable ejabberd auth script

Hello guys, hope everything is fine with you!

Whenever I enable my external authentication script through ejabberd configuration, the "add to contact list" stop working... Summarizing, I can add "bob" into alice's contact list but this invitation never reach alice's application... If I disable the external auth script, it magically works as expected...

Am I missing something here? I am currently using check_mysql_perl script...

Any help will be appreciated,
Thank you very much