I'd recommend telling your sister to send you the invite link manually, instead of using the email method.
Let me know how it goes. 🙂
You can't do that, only she (the plan owner) can do that. When she invites you, she's being asked if she wants to send an email or copy the link to send it to you I believe.
Hey there you,
Yeah, you! 😁
Welcome - we're glad you joined the Spotify Community!
While you here, let's have a fun game…