The potential challenges in adopting and integrating cloud services into existing IT systems include ensuring compatibility and seamless integration with current applications and platforms, addressing data security and privacy concerns, managing potential disruption during the transition, and navigating the complexities of hybrid or multi-cloud environments.

Additionally, organisations may face cultural resistance, skills gaps, and the need to adapt existing governance and compliance frameworks to accommodate cloud services. However, with careful planning, comprehensive stakeholder engagement, and the guidance of experienced cloud integration partners, these challenges can be effectively addressed to ensure a successful adoption and integration of cloud services into existing IT systems.