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Unfortunately 690420 isnβt a valid mod11 number and neither is 696969. I calculated all the invalid mod11 CS account numbers up through 700,000, any account number that shows up in the list isnβt valid and your own account number wonβt show up in the list. You can find the list of invalid account numbers in a GitHub repo here: https://github.com/clawesome/mod11/blob/main/mod11.txt or the raw text file at https://raw.githubusercontent.com/clawesome/mod11/main/mod11.txt. I encourage everyone to do a simple text search for their own account numbers in the list, as it would invalidate mod11 if your account is listed, but so far nobodyβs account number has been in the list. Itβs a 20mb text file and some browsers, especially mobile, may struggle with it, best to open with a text edit like Sublime Text or similar.