UltraTax CS ELF Error code CSUS01

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MFA required for electronic filing

Effective May 3rd, the 2017 version of UltraTax CS requires multi-factor authentication (MFA) to access the electronic filing transmission feature in CS Connect.

Thomson Reuters is committed to proactively evolving our security features to help you protect your firm and your clients' data. For more information about multi-factor authentication, see Multi-factor authentication overview.

Error Code CSUS01: An invalid attachment source exists; review attachments in Edit > Electronic Filing Attachments.

The following may cause this error.

For instructions on properly attaching PDF files and file limitations, see Attaching Portable Document Format (PDF) files to electronic files.

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