Background
After your account has migrated, you may be unable to modify or cancel meetings that you own. Recurring meetings and Team meetings appear to have a higher likelihood of this occurring.
This is not expected behavior and ITS is working closely with our migration partners on a resolution.
Workaround
The faulty calendar entries are still owned by your old campus account. You can request access back into that account and cancel the meeting from there. Once cancelled you can reschedule the meeting from your new account.
Information on how to request access back into your old campus account can be found here.
For Additional Help
If you need additional help, here are some options: