According to your comment about your numbers having a leading 0 in accordance with the user number, you need to include functions TEXT()in the formula in order to save (i.e. add) your leading 0.
=CONCATENATE(A1,",",TEXT(B1,"0#####"),",",TEXT(C1,"0#####"),",",TEXT(D1,"0#####"),",",E1,",",F1)
Just include as many # as possible in this number than the maximum number length.
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