Confirmation links work once and for 7 days.
What to do
Sign in to Studio.
In the banner at the top of the page, tap Send again.
Open the newest email and tap Confirm my email.
Related messages
"We sent you a few already. Check your spam folder, or try again in an hour." You can send up to 3 links an hour. Check spam and promotions for the earlier ones.
"This link is missing its code. Open the link from the email again." Tap the button in the email rather than copying part of the link.
If your email is already confirmed, the banner is gone and nothing more is needed.