I am not able to confirm my identity

Hello , I am not able to login to my personal tax account and now i cannot verify my details, I cannot get through to do my SWE registration due to this. I am not sure whom to call or what to do. I did send a written letter, passport and brp, still im not able to.

Hi Fasna Naisan,
For help registering for your personal tax account, please get in touch with our online services team by webchat or phone here:
Technical support with HMRC online services
Thank you.