Hi Shailaja,
First of all congratulations on clearing the interview of MFM 2020 IN NIFT.
Like you said the application number is of 7 characters and the counselling form requires 6 digit number for registeration.
The problem must have happened is that you don't have to write your application number but some other credential ID Number which you have got after clearing the interview , because other wise anyone can regsiter for counselling process even if they have not cleared the interview .You must have got a unique id after clearing the interview which you have to use for further process.
I hope your problem gets resolved ,
GOOD LUCK...!
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