Check these in order
- Names match exactly on every board, including capitals. "Due date" and "Due Date" are different.
- Types match: Status with Status, People with People, Date with Date. A Status column will not sync to a Text column.
- The column is not excluded for this item. Look in the Excluded list in the Mirror Item tab.
- It is not a Formula, Auto Number or mirror column. monday.com calculates those, so no app can write them.
- For Connect Boards columns, turn on Auto-fill Connect Boards Column in Mirror Item.
- Make a small change to the item to trigger a fresh sync.
Tip: Renamed a column recently? The rename breaks the match. Rename it back, or rename the column on the other boards to match.
