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    Nintex Knowledge Base

    Error "Failed to send notification. Collection was modified; enumeration operation may not execute."

    Status: Work in Progress

    ISSUE
    When running a workflow with a Send notification action, the workflow might fail and the following error is logged in the workflow status:

    Failed to send notification. Collection was modified; enumeration operation may not execute.
    ERROR CODE
    RESOLUTION
    ADDITIONAL INFORMATION
    This is a known issue that is currently under investigation.
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