Alternate mate in 3 not accepted in puzzle

en.lichess.org/training/3310

Accepted Solution: 27... Rd1+ 28. Ke2 Qh5+ 29. Qf3 exf3#

Alternate Solution: 27... Nd3+ 28. Kd1 (28. Qxd3 exd3+ 29. Kd1 [29. Be3 Qe1#] Qc2# ) Nxb2+ 29. Ke1 Rd1#

Both ways are mate in 3.