This stanza taken from the XEP-0045 spec is not supported by the MediatedInvitationModule which recognizes the invite criteria only, but not the decline
On the older InvitationModule i can see that it was supported.
<message
from='hecate@shakespeare.lit/broom'
id='jk2vs61v'
to='coven@chat.shakespeare.lit'>
<x xmlns='http://jabber.org/protocol/muc#user'>
<decline to='crone1@shakespeare.lit'>
<reason>
Sorry, I'm too busy right now.
</reason>
</decline>
</x>
</message>
This stanza taken from the XEP-0045 spec is not supported by the MediatedInvitationModule which recognizes the invite criteria only, but not the decline
On the older InvitationModule i can see that it was supported.