Salesforce checkboxes are true/false fields and Account Engagement checkboxes are multi-selects, which can cause some confusion if you try to map them together.
You can create a basic true/false checkbox that syncs between Salesforce and Account Engagement.
1) Create or edit a Account Engagement form.
2) In the Fields tab, click + Add New Field.
3) Select your custom field from the Prospect Field dropdown.
4) Click Load Default Data next to the dropdown.
5) Change Type to Checkbox.
6) Click the Values tab.
7) Click the trashcan icon next to the false value to delete it.
8) Click the A icon next to the true value and enter text that will be displayed next to the checkbox.
9) Click the Basic tab.
10) Optional: delete or edit the text in Label.
11) Click Save changes to exit the form field editor.
12) Finish editing your form and save as usual.
NOTE: When implementing this keep in mind that if the prospect leaves the box unmarked on the form, it will be processed by Account Engagement as an empty value.
The sync behavior will slightly differ when dealing with null or empty values. See this article for more information.
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