Individuals living with speech impairments may require an augmentative and alternative communication (AAC) device to be able to speak or interact with other people. The implementation of an AAC device is fundamental to facilitate effective communication, expand social interaction, and to be part of the community. A team of developers at Bruyère - Saint-Vincent Hospital has been developing an AAC device called SensAct to fulfill those needs. Despite extensive advancements, stakeholders at the hospital feel the technology has usability issues preventing it from being implemented and used by a wider audience. This study aims to investigate factors influencing SensAct's usability, specifically, focusing on SensAct's user interface and usability issues that arise when configuring the system for healthcare clients. Using qualitative methods from human-centred design, this study identified systemic factors that influence AAC/SensAct implementation, and three key usability issues: time constraints, the use of complex technical terms, and sophisticated user interface.