I know how important it is to maintain a smooth tax filing experience, and it’s best to treat this matter with urgency, Theresa.
Error EC9252 occurs due to incorrect information entered or a setup. Please take a moment to review the details you’ve entered and ensure everything is set up correctly. You can visit this link to help you fix the error you've encountered: Fix Pro Tax submission errors in QuickBooks Online Accountant.
You mentioned that you followed some instructions. Could you please specify which instructions you followed? This will help us assist you more effectively.
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If the issue persists, I recommend contacting our Live Support team. They possess advanced tools, including screen-sharing sessions, which enable them to provide real-time assistance.
I've added an article that you can review to identify potential errors in your return before submitting it to HMRC: Review the audit checklist.
If you have any questions about this, you can always add to this forum.
