SBR.GEN.AUTH.003 - Reporting party identifier information is missing from the lodgement.
Things to check:
1. Are you a tax agent? Only a tax agent can lodge a trust tax return with no ABN.
Please check your "Gear wheel" > Firm "Settings"- Make sure you've got your tax agent number.
2. Do you have a MyGov ID?,
3. Do you have a TFN for the Trust?
Make sure to fill your Client information details via "Settings"
Reporting party is the info relating to the client/payer.
Go to "Settings" making sure you complete the details correctly.
Settings --> General
Settings ---> Contact details
ABN is not required for lodgment in case when the user is tax/bas agent (intermediary) and has TAN.
In case of business entity either main organisation or client must have ABN.