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The short answer

After years of supporting board syncing at scale, nearly every “boards stopped syncing” report traces to one of five causes, in this order: (1) column names/types don’t match exactly, (2) a status column can’t accept a new label, (3) permissions on a private board, (4) rate limits during bulk operations, (5) a webhook got removed. Work the list top to bottom — each has a fast check.

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1. Column names must match — exactly, including case

Columns sync when the name and type match on both boards. “Due Date” and “Due date” are different columns; a Status column won’t sync into a Text column. The fastest check is column mapping — it shows exactly which columns will sync and creates missing ones in one click. Full walkthroughs: columns aren’t syncing · column mismatches.

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2. The status column won’t accept a new label

The classic silent blocker: the destination board’s status column is at its label limit or restricted, so the incoming value can’t be written — and the failure cascades into what looks like “one-way sync” or “boards won’t connect.” Check whether the destination status column can accept the source’s labels (add one manually as a test).

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3. Permissions and private boards

Automations act as the user who authorized them. If that user can’t access the destination board (private board, revoked access, changed role), item creation fails — sometimes loudly (“no permission to duplicate pulses”), sometimes quietly. Verify the authorizing user is a member of every destination board.

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4. Bulk syncing and rate limits

Sharing hundreds of existing items at once runs into monday.com API rate limits. Use batch actions in moderate batches (10–15 items) rather than one huge push, and let a batch finish before the next. For very large boards (thousands of items), stagger by group or status.

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5. Webhooks were removed

Syncing rides on board webhooks. If an admin cleans up webhooks or a board is duplicated from a template, sync events stop arriving. See why SIMB adds webhooks and how to restore them. Shared-item quota is spent on active connections. Set an automation to unlink items when they reach a final status — the item stays on its home board, the cross-board link is freed. (Prefer manual unlinking when only some closed items should disconnect.)

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Still stuck?

The Discrepancy Report shows exactly which items and columns disagree across boards — start there, then contact support from the app with the item link. Support is measured in fewest-messages-to-resolution, so include the board and item in the first message.