What "the field" are you referring to? If possible, screenshots are always helpful.
And, if you are referring to something in a SQRL Client, please identify what Client are you using.
In which case, you might also get a better response if you post under the topic for that specific client?
The inability to enter 0's or 1's suggests that you have selected 'Import an Identity' using 'Text Entry' as the source. The rescue code is a 24-digit number. An exported text identity is 100+ base-56 characters which exclude ambiguous characters such as 0 and 1.