A public link shows "This resume isn't available" when:
sharing was turned off (set back to Private)
sharing was turned off and on again, which creates a new link
the owner's account is no longer on Pro or Lifetime
the resume was deleted
Fix it
Open Plan & Billing and check your plan badge says Pro, Pro Yearly or Lifetime.
Open the resume in the editor.
On a computer, select the share icon in the toolbar (between the copy icon and Export). On a phone, tap More, then Share link.
In Share this resume, check Public link is selected.
Choose Copy next to the link and send the new link.
"We couldn't load this resume" is different: it's a connection problem. Choose Try again.