You might remember i was asking for help and guidance in regs to my uncles crypto that i was left after he passed away.
Yes, You have already created two topics regarding your issue and some users of the forum provided you the solution.
The secret code for Bittrex is 16 characters (alphanumeric)
Coinbase is 16 characters (letters and numbers)
You should import those secret codes into a 2FA application like google authenticator or Aegis.
Those applications will generate a temporary 6-digit code that you need for logging in to the account.