Hello there, Missy0780.
The Software ID can be found when you click the Connect the ATO button. You can find this button on the GST page. I've got you a screenshot as your reference.
I also have some articles that you can check:
Feel free to let us know if you have more questions. We'd be happy to answer them.
'Connect to ATO' does not show when I am in the GST Centre
Hello there, @Robert Perkins.
I just wanted to inform you that I've already responded to your question on this thread: https://quickbooks.intuit.com/learn-support/en-au/gst-and-bas/re-yes-you-can-shiraz-connecting-the-a....
To ensure keeping the conversation streamlined and provide you with the best resolution, please post any follow-ups there.
If you need anything else, please let me know. I'll be here to help. Have a good one.
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