Hi @GarthVader66
Thank you for your post. Welcome to the MYOB Community Forum, I hope you'll find it a wealth of knowledge.
Generally speaking, something like this happens if you have added a new declarer to the report using STP and they have edited the business details or someone else has gone into the ATO and changed the details there. To check if you're reporting using the correct software ID, go to Payroll Reporting>>Payroll Reporting Center>> ATO settings and check the software ID there. In case it is incorrect notify the ATO of the correct ID.
I hope this helps, Let me know if you need further assistance with this. I'm happy to assist.
Best Regards,
Cel