Hi. I don't normally have a problem presenting my Spanish tax online, using an electronic certificate. However, yesterday I got the following Error 403 message (in Spanish) : "Identification error. Electronic certificate is not detected or has not been selected correctly. If you have an electronic certificate, check that it is correctly installed in the browser" I have checked that the certificate is loaded on the browser, that it is valid, and I have validated with the FNMT, which reports that it is working normally, so, why does my browser not recognise/detect the certificate. Without resolving this issue I cannot make my tax declaration. I would really appreciate any suggestions, please