Collaborative ideation plays a vital role in driving creativity and innovation across various professional and educational contexts. This study investigates the experiences of disabled individuals within the collaborative ideation process, specifically examining their utilization of digital whiteboarding tools. Through interviews with 19 professionals and academics with disabilities, alongside a thematic analysis of online forum posts for two popular digital whiteboarding platforms (Miro and Figma), we delve into the access barriers encountered by disabled individuals and the strategies they employ to create access in collaborative ideation. Our findings illuminate the multifaceted nature of access barriers, encompassing issues such as inaccessible visual features, technology-induced discomfort, unstructured nature of freeform content, and complex communication setups. Furthermore, we uncover the intricate dynamics involved in negotiating diverse access needs and conflicts within teams involving people with different disabilities. Through this analysis, we highlight tensions around proficiency with inaccessible technologies stemming from ableist standards of professional success and discuss the implications of our findings for the design of accessible collaborative ideation systems.