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when you wrote in the details did you write them exactly as they appear on official documents ie. first your sirname then your first name then,if you have one your second name. then the cf must be written all together no spaces in capitals it should work like that.

.... they decode your surname and first name to a CF on the fly and compare it with the CF you enter? Interesting, but this may also be a problem in as much as you never know what was put in by the person inputting you details to provide you with the CF for example if you give a name like "John James" to an �������� official (well even to me for that matter).  Perhaps people should use the on-line CF generator to validate exactly what was used for their original CF, I'm sure there was a link to it here on the forum. 

  Had a similar problem recently trying to log-on to Enel online, would not accept my C/F, found that the supposed zero was actually the letter o....double check all digits and letters.

Thanks for all the contributions. Will try again.

Hi S & J Sorry haven't been on here for such a long time and just seen your post. We had the same problem with our CF's and found out after many attempts, that you have to put in your 'middle' name if you have one also. This worked when registering for our Banco Posta online account. Hope this helps! S & M