I dont know whats wrong with your tama but i donated 5021 points and i got a password.Try to keep donating and then maybe it will give a password.Some other people had this problem too so youre not the only one. they just kept donating.I wont tell you what i got from the king because it will ruin the surprise!!!
His Excellency, the Tamagotchi King, allows only those who are pure of heart to enter his chambers. Therefore, you will need to make a donation to his national charity. However, you must also prove your continued dedication as a charity patron. You must make at least three individual donations, totaling a minimum of 5000 "Gotchi" points to receive a password to visit him. Continue to make donations often to earn up to two more visits with him!
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The key point is that donating 5000 (or more) in one shot won't give you a password. You have to do it in at least three transactions. 2000 + 2000 + 1000 works.
Just give him a couple more points in a couple more donations, and the 5000 point password should appear.