Are you sure you put your correct details? Check again! If you have changed/updated visa in the past or have had various brps in the past. It will be the previous one you had, not current one… ‘cos that’s what you’ll have opened your ukvi account with then. You get?
Last time when I called UKVI and I got to know that this service is not applicable to those who applied via VFS and had their biometrics done. Hence you get this error.
O don't know if the immigration have my email address because I didn't contact them about my status and since I have my ilr back 2007 and I didn't apply for brc too