Hi folks,
We’ve recently enabled the Lucidspark/chart plugins within our O365 tenant for teams. I was very excitedly trying to show off the capabilities to my team mates who do not yet have lucid licenses, when we hit a snag.
When sharing a Lucidchart/spark with a Teams meeting, where the participants do not have Lucid logins, the chart/spark is shared globally (I can see the permissions are set to everyone see the link) but the experience for the non-licensed users is a black screen:

Browsing to the same lucidspark via a shared link/browser, shares the board just fine with an unauthenticated user.
The use case here is for sharing and collaborating with participants external to our organisation, such as clients on a brainstorming workshop or scoping session, where asking them to register to a new whiteboard solution may be against policy or create a clunky experience that will delay the start of the meeting.
The latest documentation for integration of Lucid/Teams appears to reference the older MS Teams interface, so it is of limited benefit.
Wanted to understand if others have the same issue and if there is a known fix or admin setting that we are missing that should alleviate this problem?
Thank you for any help!