Unable to add AdSense account number to profile

after several attempts i've had no luck. has this function been disabled?
i'm certain i've added it in the proper format, just as expected and written in the profile page.

any ideas?

 

What error it is showing ?

 

every time i attempted to save the number, it would take me to an error page asking me to input the number as directed on the previous page, which i had already done a dozen times exactly as indicated.

on the bright side, after seeing your response i went back to input the number again to get the specific error message and i failed this time, as it chose that moment to go through.

all's well.

 

It's a bug in vBulletin already discussed a few threads back so it's matter to try again until succeed.