Why are two Boeing astronauts stuck in space?

A series of problems with new Boeing CST-100 Starliner spacecraft has delayed return to Earth. https://www.aljazeera.com/news/2024/6/27/why-are-two-boeing-astronauts-stuck-in-space?traffic_source=rss&feed_id=37560&_unique_id=667dcff1bbfe3