I got the invitation e-mail but cannot see it in the panel

An invitation appears in the panel only in the account it was sent to. Check the causes below in order.

You signed in with another account

Sign in with the e-mail address the invitation was sent to. If you have more than one account, the invitation is only in the account of this address.

The invitation expired or was closed

The Invitations tab lists only invitations awaiting your response. An invitation that expired or that the editor closed is not in the list. When you open the link in the e-mail, the invitation page shows its status.

You already responded to the invitation

An invitation you accepted is on the Reviews in progress tab. A review you have submitted stays on the Completed tab. Invitations you declined do not appear in the lists.

Your e-mail address is not verified

The reviewing screens require a verified e-mail address. If a new account was created with the invitation, the link for setting a password also verifies your address. If you have not used this link yet, open it first. The steps are in Responding to a Review Invitation.