Someone added me as a contact but I don't see them in Trusted Contacts

If someone adds your phone number or an email address that is not associated with a Google Account, you will first need to connect to your Google Account in order to see the person in Trusted Contacts.

To connect to your Google Account, follow the instructions in the email or SMS message that you received when the person added you. If you cannot find the email or SMS message or it has been more than 60 days since the person added you, ask the person to remove and add you as a contact again.