9-8-8 Lifeline Cybersecurity Responsibility Act This bill requires the Substance Abuse and Mental Health Services Administration (SAMHSA) to undertake efforts to protect the 9-8-8 Suicide & Crisis Lifeline from cybersecurity threats. (The lifeline is a three-digit number that connects callers in suicidal crisis or mental health distress to a national network of crisis centers.) The bill also expands related reporting requirements. Specifically, the network administrator for the lifeline must report identified cybersecurity incidents and vulnerabilities to SAMHSA, and local and regional crisis centers that participate in the lifeline must report identified cybersecurity incidents and vulnerabilities to the administrator. Additionally, the Government Accountability Office must conduct a study that evaluates cybersecurity risks and vulnerabilities associated with the lifeline and report the findings to Congress.