Problem after transfer of meeting room calendar

Hello,

Here is my problem: historically, we had mailboxes for meeting rooms that were simple "user mailboxes".

- To solve this nonsense, I created real mailboxes "rooms". Then I exported the old accounts calendar to the new ones (in ics format). I have disabled old accounts so that users do not set their appointment on them.

- Except that I had not thought of the following situation: if a user wants to cancel a meeting that was created in the old "environment", the appointment is always present on the new and prevents another user to reserve the slot .

=> Explanation: the user has invited the "room" (under the old environment) but this cancellation is not reflected on the new room account. Even if the appointment is deleted from the user's calendar, it persists on the new meeting room account and prevents another user from using the time slot.

Can you help me please ? In fact, one of the solutions would be to be able to add the "alias of the account" (second account if you want) among the participants in all the meetings to which the 1st account of origin is invited.

I wonder if it would be possible to transcribe it with Powershell ...