Is it just a Web Client issue - or a server issue ?
If you have enabled external users to invite the room (I believe you said you have this configured) and you login to a gmail account for example, open the Calendar app, create a new event, and invite email@example.com and firstname.lastname@example.org to the meeting - then you should get a response back from the server to say whether the boardroom has accepted/declined the invite.
If that part works - then perhaps it is just a client issue.
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