When creating a new Record on Salesforce with the Box for Salesforce integration installed, the following error message is returned within the Box Embed widget/section on the page layout:
"User was already collaborated but we were unable to determine the existing collaboration ID." "user_already_collaborator"
Environment
Box for Salesforce managed package.
Resolution Steps
On Box, remove the user's collaboration from the higher level folder (object level folder).
Root Cause
This case typically happens when the Salesforce user's box account is manually added as a collaborator at the Object level folder (e.g. "Accounts"). Users should not be collaborated manually at the Object level folder. Since the integration creates collaborations automatically at the record level, inheriting the user's Salesforce permissions to that record, a conflict can be created if a pre-existing collaboration was created at the object level.