Recurring meeting not updating

Hi.

I have a problem with a user that says he scheduled a repeating meeting once a month with room TBD (To Be Determined). Then he found out that each day he has a different room; so he went to each one of the repeating entries and updated the room field, but the update never got to any of the participants and only himself can see the change of the rooms. Any ideas? I have no clue what’s going on there.

Thanks in advance!