Semanda

Hello, I am trying to claim for my WFH Tax Relief (£6 per week) and I can not do this as it keeps saying my details are incorrect. I tried to verify my identity using my p60 (as provided to me by my employer) and passport (which I have in front of me) and the system has locked me out. How else can I do this other than online as there seems to be a problem via the Government ID gateway.