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FIDO2 (Fast IDentity Online 2) - an open standard for user authentication that aims to strengthen the way people sign in to online services to increase overall trust. FIDO2 strengthens security and protects individuals and organizations from cybercrimes by using phishing-resistant cryptographic credentials to validate user identities. (reference: https://www.microsoft.com/en-us/security/business/security-101/what-is-fido2?msockid=0bca323f9b0b69093e5c21169aa36806#whatarepasskeys )
Mass Communication - a communication sent out to a high number of individuals, often sent in more than one technological method.
Notification fatigue - weariness from a large amount of technology notifications that can occur on multiple technologies often resulting in the loss of communication to a person whereas the person is too overwhelmed with the amount of notifications and chooses to skip, or completely misses the communication all together.
SMS - short message service: a system for sending short text messages, as from one cell phone to another or from a computer to a cell phone. (reference: https://www.dictionary.com/browse/sms)