Welcome to the community forum.
Regarding the headphone jack, please see this topic and continue there …
Regarding the notification LED … this is not a bug technically, as this feature for smartphone vendors seems to be optional in Android nowadays (regardless of how much people would perhaps want to have that), perhaps it still can be implemented with an update.
Please continue in this topic …
This is a community forum, not the company. Fairphone staff might read along and engage here occasionally, or not.
Please contact support … https://support.fairphone.com/hc/en-us.