UNTIL AN ADDRESS IS CONFIRMED, IT DOES NOT EXIST. It works neither for signing in through a provider, nor for recovering access, nor for transferring farm ownership, and it is not shown as a contact. This is not a processing delay but a rule: the address is the key by which the product recognises a person, and unverified it must not work.
Only the person who reads the mail at that address can confirm it. Neither the owner nor an administrator can do it for them.
The link is single-use and lives for a day. If the time has run out - set the address again, and a new email goes out.
Saving the same address again does NOT send a new email: an email that arrives for no reason devalues the one that mattered.
The former address keeps working until the new one is confirmed.