Explanation
The first important step is identifying and managing all the stakeholder groups that an organization deals with.
The first and most obvious stakeholder group is the customers, as in service management the organization's main goal is to facilitate customer outcomes. Other examples of stakeholder collaboration include:
Developers working with other internal teams
Suppliers collaborating with the organization
Relationship managers collaborating with service consumers
Customers collaborating with each other
Internal and external suppliers collaborating with each other
The contribution to improvement of each stakeholder group at each level should be understood, as should the most effective methods to engage with them. Depending on the service and the relationship between the service provider and the service consumer, the expectations about the level and type of collaboration can vary significantly. It is important to involve stakeholders, and address their needs at all levels. Determining the type, method, and frequency of such messaging is one of the central activities related to communication.
https://www.bmc.com/blogs/itil-guiding-principles/

Reference: https://www.sysaid.com/blog/entry/the-7-guiding-principles-of-itil-4-practical-advice-to-help-you- make-decisions

Explanation
A help desk is considered to be focused on break-fix (what ITIL calls incident management), whereas a service desk is there to assist with not only break-fix but also with service requests (requests for new services) and requests for information (such as "how do I do X?").
https://www.atlassian.com/itsm/service-request-management/help-desk-vs-service-desk-vs-itsm#:~:text=A%20h