Hi, @mikkimichaelis,
Correct, the error you’re facing with the Meeting SDK is because the Meeting SDK App Type is not published.
If you’re trying to join or start a meeting from a different account than the one where the Meeting SDK App Type was created, you’ll need to publish your Meeting SDK App Type.
However, there is no need to worry. If the meeting is within the same account, you can still join or start it, even if the Meeting SDK App Type is unpublished. However, if the meeting is in a different account, you will need to submit your Meeting SDK app to the Marketplace and make it available for others, so that you can use the credentials for other accounts as well.
Here is our documentation for Zoom SDK App Requirements