Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Dear Reto Kai,
Error code 0x80040217 (Record Is Unavailable) may indicate that the field metadata is no longer fully accessible, but a reference to it still exists in the Dataverse table.
However, since this issue relates to Dataverse metadata and Power Platform, it falls outside the primary scope of this Microsoft 365 and Office forum. I would also recommend posting in the Power Platform Community, where Dataverse specialists are more likely to have experience with orphaned columns and metadata-related errors:
https://community.powerplatform.com/
As a forum user like you, my resources are limited, and I do not have access to your environment or the backend tools needed to investigate the orphaned record. The Power Platform community is the best place for this scenario, and if needed, they can advise whether a Microsoft Support ticket is required.