I asked for a registration link and nothing arrived

The link is valid for 60 minutes. If more than that has passed, ask for a new one. The old one stops working rather than being reusable.

Check the spam or junk folder first, and search for the sender rather than the subject.

If your company filters mail, the message may be held there. An address at a domain you control is more reliable than a free mailbox for this reason.

Nothing you typed exists until the address is proven, so asking again costs nothing and creates no duplicate.

If this did not answer it: support inside your account is under development, and until it opens, this says what does reach a person.