Hey there @beyzanurcobann,
Thanks for reaching out to the Community about this.
In case you receive this error message you need to get in touch with SheerID. They'll send you an email including a valid activation link allowing you to apply the student discount to your Spotify account.
You can contact SheerID here.
Hope this helps. Let us know if you have any more questions.
IvanModerator
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“Music is the wine that fills the cup of silence.” - Robert Fripp