This is happening to me too. I have uploaded my first STP from Reckon Hosted (6 April 2020), I have received a notification from ATO saying "Welcome to STP - the ATO has received your first STP report' BUT my first submission came back as error, so I submitted it a day later. I still have 1 x 'Error' and 1 x 'Pending' showing, even when I click into 'Details' as mentioned as a fix previously.... it doesn't change to Success...(9 April 2020)

Any ideas??