CMN.ATO.GEN.438065 - Declaration signatory identifier is required.
Solution:
You need to click the gear leaver , top right. Select Settings. Ensure you are the signatory. (See example attached). If your name is not there in the signatory field, first add yourself as a client.
Select "Settings", Ensure you are the signatory.
If your name is not there in the signatory field, first add yourself as a client.