Use Twitch Prime with Prime Student?

I created an Amazon Prime Student Account, everything went so far, now I wanted to connect my Twitch account to my Prime Account. That worked, but now I have to activate the account. Here I always get the error message:

"Oh no! Unfortunately we can't activate Twitch Prime in your account. It looks like there was an error activating Twitch Prime. Common problems are credit card issues for Prime if the credit card may be invalid or declined has been… "

I have only deposited my bank details and no credit card. Can someone help me there?

I didn't have the problem… Either you try again tomorrow in peace, or write with an Amazon employee in their chat… They are always super fast and so far you could help me with such things directly.