Set up OATH (Google Authenticator) Token Settings
If you plan to use OATH Tokens (e.g. Google Authenticator) then set “OATH token digits” to “6”. If you are using physical tokens that have an 8-digit readout, set it to “8”. This setting applies domain-wide, so you must select OATH tokens that all have compatible length OTPs.
Note: You cannot force a token app to use a different number of digits than it is programmed to use by altering this value.