What is the cause of "The XXX organization cannot be invited because it has marketplace applications"?

[OndrejSpanel]

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I want to start a trial of enterprise. When doing so, I am told "The XXX organization cannot be invited because it has marketplace applications."

I am not aware of any. I had two private GitHub applications in this organization, but even when I moved them to a different account, nothing has changed. How can I find what "marketplace applications" are blocking the trial?

[OndrejSpanel]

I have found an answer in https://docs.github.com/en/billing/managing-billing-for-github-marketplace-apps/canceling-a-github-marketplace-app

I had activated a free subscription of one app long time ago and forgotten about it, because I was not using the app.

[queenofcorgis]

@OndrejSpanel nice self-solve ✅ thanks for coming back to share the answer, this helps others who may have the same question as you.