Whether Agents of SHIELD is canon to the Marvel Cinematic Universe once again comes into question thanks to Marvel addressing Nick Fury's adventures. Before the current era of Marvel Studios shows, there was the Marvel TV series that aired on ABC, Hulu, Freeform, and Netflix. One of them was Agents of SHIELD, the longest-running Marvel TV show in the company's history, which centered on Phil Coulson and his team while having connections to the MCU films. But over the last few years, there have been a lot of debate as to whether or not the ABC show actually is canon to the MCU.

https://screenrant.com/nick-fury-marvel-bio-agents-of-shield-canon-dispute/