Hi New2AR,
It's a good idea to check your payroll reports like Payroll Activity, Payroll Register, and YTD Verification to make sure everything matches up. If the figures in MYOB look right but don't match what the ATO has, try sending an Update Event in STP to refresh the data. After that, check the STP reports in the ATO portal to see if the numbers update correctly.
For more details, check out this link: End of year finalisation with Single Touch Payroll reporting.
If you need further assistance with this, it's best to reach out to our live chat support through our virtual assistant MOCA or submit a case via MyAccount.