Hi Isaac thanks for posting in the community! Only one Lucidchart team can connect to a Confluence instance at a time. So once you merge instances only one of your teams can connect. As far as the inserted Lucidchart diagrams from the instance you are merging into the other it's possible they will have trouble displaying post-migration. If that occurs you will need to re-insert them using the Lucidchart add-on in order to reset things.

If you run into any issues or have more detailed questions please email support@lucidchart.com and we can take a closer look!