The following error indicates that the either the submission service is temporarily inaccessible and/or there is a connectivity issue so the software cannot connect to the STP submission service.
If may be that the location you are submitting from is outside Australia and the ATO geo-blocks submissions.
Solution: Resubmit the STP event or resubmit from a location inside Australia.
You may need to restart the software before attempting a resubmit.
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