Please try to change branch id to 002 in "Settings" -> "General"
Why need change of code?
-> Because the ATO assigned a branch on the ABN. Possibly your client has two separate businesses under one ABN.
Failing that, check the following:
A. The ABN is still active.
B. The ABN is correct or That identifier in LodgeiT are correct?
C. Can you able to lodge activity statement bas for other entities?
D. Can you confirm that this entity causing issue is in your ATO portal and has not expired?
E. What period does the BAS relates? ATO is not allowing lodgement for old forms, please lodge via portal.
Note: Branch code will depend on what is recorded in the ATO portal. If you are experiencing the same error, always check what code is recorded in ATO's activity statement.
How to compare LodgeiT code and ATO branch code?
Navigate to ATO portal, click "Lodgements" and select "Activity Statements"
Note, check the ABN and TFN if portal and LodgeiT details are matched.
Below is an example on how the branch code should appear -
Remarks:
There could be varied reasons of why the issue occurs. Sometimes ATO needs to resolve the issue via backend and sometimes it's impossible to lodge specific Activity Statement online even via Online Services for Agents so user needs to contact ATO to make the lodgment.
Usually in such cases we send the request to ATO, however it can take ATO up to 2 weeks to investigate the issue and very often their advice for user is to contact ATO directly. We recommend that you call ATO to get further instructions - this way ATO will respond much faster. If it won't help, please let us know, then we will raise the incident with ATO their tech team.