Solved! Go to Solution.
For anyone still wondering about this, it looks like there's a workaround. Here's a snippet from a recent chat I had with one of their support agents:
As stated in our Terms and Conditions, it’s not currently possible to pay for a Premium for Family plan using a gift/e-card.
However, we totally understand your frustration, and we don’t want to see you miss out, so we’ve devised a temporary workaround for you.
If you subscribe to Spotify Premium (not Premium for Family) using the gift card as payment, then upgrade your account to Premium for Family directly after, the gift card value will be automatically converted to your new Premium for Family plan.
That’s it! We appreciate your understanding and hope you find this workaround useful.