Hello everyone, and thank you for keeping us updated on the situation.
As @vendy mentioned above, our dev team investigated this issue and also observed the “Media ID is not available” error affecting Instagram for Business users intermittently. Based on the team’s findings, the root cause of this issue lies with Meta who experienced similar problems recently. You can find more details in this discussion on the Meta Developers Community.
At this moment, we recommend reaching out to Meta Support for assistance and using the above thread in the Meta Developers Community as an additional resource. Unfortunately, there are no workarounds we can offer on our side.
We’re sorry for the inconvenience, and thank you for your understanding 