Have them check spam or junk first, then double-check you used the exact email they sign in to Wishpicks with. The invitation is tied to that one address, so a typo or a second email account is the usual reason it seems to have vanished.
Steps
Ask them to look in spam or junk. The accept link is inside the email.
Check the address you invited. Open the wishlist's access (sharing) settings and compare it to the email they'll actually sign in with: their Google, Facebook, or magic-link address. If it's wrong, remove that invite and add the right one.
See whether they need an account. Signing in works through Google, Facebook, or an emailed magic link. Someone new can register with the invited email first, then open the invite.
Send it again. Open their pending entry in your access list and choose Resend invitation.
Send them the link meanwhile. Copy the wishlist link so they can view the list right away. A link never grants editing, but it keeps things moving.
Good to know
You only need to invite someone when you want them to edit. If they just need to look at the list, and reserve a gift if you allow it, the share link is enough. See "What is the difference between viewing and editing access?"
Editing starts once the person accepts and signs in with the same email you invited. If the email arrived and they still can't edit, see "Why can't someone edit my wishlist?"
Invites don't expire, so the accept link stays valid until it's used or you remove the person's access. If you keep seeing "try again later," that's the guard against invite spam. Wait a few minutes and send it again.
Still stuck? Email [email protected] (Monday to Friday, 9:00–18:00 EET, usually a reply within one business day), or use the in-app messenger for something urgent.
Related
"How do I invite another person to edit my wishlist?"