Error: LGT.GEN.ERR.0000005 – The tax agent phone, email and address are required.
What this error means:
This error appears when the system cannot find complete tax agent contact details. To proceed, the following information must be provided:
Tax agent phone number
Tax agent email address
Tax agent business address
If any one of these is missing or blank, the system will block the action.
Common causes
Tax agent profile is incomplete
Phone, email, or address fields were left empty
Incorrect or invalid contact details
Tax agent details were not saved properly
Update via Gear Wheel > Agent Set Up
If you are not a tax agent lodging in behalf of client,
Please check the "Whom use as a person to contact?" maybe you selected "Agent"?

Try to change to "Client" instead.