Hello there, Julie. To provide a more targeted resolution, I would require further details about the challenges you are experiencing when submitting your T5018 XML file to CRA.

Could you please specify the exact error message you're receiving? If possible, an attached screenshot would be greatly appreciated, as it will allow us to better understand the issue visually.

In the meantime, you can browse this helpful article regarding the latest updates made by the CRA: Changes to T4, T4A, T5018 XML electronic filing to CRA.

We look forward to your response, Julie. Have a wonderful day ahead.