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 transmit e-files from CS Connect. Find out more.

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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