The responsibilities described fit those of a "guide." A guide in an audit context is typically someone from the auditee's organization who facilitates audit activities, manages logistics, ensures compliance with health and safety policies, and may also witness the audit process, assisting the audit team.
References: ISO 19011:2018, Guidelines for auditing management systems

Explanation:

According to ISO 27001:2013, clause 5.2, the top management of an organization must establish, implement and maintain an information security policy that is appropriate to the purpose of the organization and provides a framework for setting information security objectives. The information security policy must also include a commitment to comply with the applicable legal, regulatory and contractual requirements, as well as any other requirements that the organization subscribes to. Therefore, maintaining regulatory compliance is part of fulfilling the management system policy and ensuring its effectiveness and suitability. References:
* ISO/IEC 27001:2013, Information technology - Security techniques - Information security management systems - Requirements, clause 5.2
* PECB Candidate Handbook ISO 27001 Lead Auditor, page 10
* ISO 27001 Policy: How to write it according to ISO 27001

According to the PECB Candidate Handbook1, one of the principles of auditing is confidentiality, which means that auditors should respect the confidentiality of information obtained during the audit and not disclose it to unauthorized parties. The handbook also states that auditors should only report audit results to those who have a legitimate need to know, such as the client, the auditee, and the certification body. Therefore, sharing the findings with other relevant managers in A or B's other customers would be a breach of confidentiality, as they are not directly involved in the audit process or the information security management system of B.
Sharing the findings with B's Information Security Manager or other relevant managers in B would be appropriate, as they are part of the auditee organization and responsible for the implementation and improvement of the ISMS. Sharing the findings with A's supplier evaluation team or B's certification body would also be acceptable, as they have a legitimate need to know the audit results for the purpose of supplier selection or certification, respectively. References: 1: PECB Candidate Handbook - ISO 27001 Lead Auditor, pages 7-8.

Explanation
An organisational measure is a measure that involves the establishment of policies, procedures, roles, responsibilities, and structures to manage information security within an organization. Examples of organisational measures include security policies, awareness programs, risk assessments, audits, and incident response plans. A policy is a statement of intent or direction that provides guidance for decision making and actions within an organization. A policy defines the scope, objectives, principles, and roles for information security management. Therefore, formulating a policy is the first step in a structured approach to come up with an organisational measure to protect laptop computers. References: ISO/IEC 27000:2022, clause
3.47; ISO/IEC 27001:2022, clause 5.2.

The main purpose of a Stage 1 third-party audit is to determine readiness for a Stage 2 audit. A Stage 1 audit is a preliminary assessment that evaluates the organization's ISMS documentation, scope, context, and objectives, and identifies any major gaps or nonconformities that need to be addressed before the Stage 2 audit. A Stage 1 audit does not introduce the audit team to the client, as this is done during the audit planning phase. A Stage 1 audit does not check for legal compliance by the organization, as this is done during the Stage 2 audit. A Stage 1 audit does not prepare an independent audit report, as this is done after the Stage 2 audit. References: : CQI & IRCA ISO 27001:2022 Lead Auditor Course Handbook, page 70. : ISO/IEC 27001 LEAD AUDITOR - PECB, page 23.