The guiding obligations and good practices which determine whether a project is genuinely being managed using PRINCE2 form the 'Principles' of the method. PRINCE2 is founded on seven principles that must be present in the project management approach to consider the project being managed using PRINCE2.
References: PRINCE2 Foundation manual, PRINCE2 official resources

An internal factor to consider when tailoring PRINCE2 to a specific project environment is "The organization's procedures." Tailoring must take into account internal practices, procedures, and organizational culture to ensure that the project management approach aligns well with internal governance and can be effectively integrated within the organizational context.References: (PRINCE27 Foundation Handbook, AXELOS)

Explanation
Reference https://www.prince2.com/blog/the-7-principles-themes-and-processes-of-prince2/