Here are the current issues going on right now:
[FIXED] People not being able to access Atlas post 4.21 update - Issue has been identified. Fix is on the way.
[FIXED] Kingpin Event: Attacks on Kingpins are not giving gold or glory - Issue has been identified. Fix is on the way.
[FIXED] Farmers not regenerating: Engineers are on this issue working to identify the cause.
[Update] In order to ensure that everything is working smoothly, we have delayed PvP until 9am PST April 13th, so players will be once again to attack enemy primarchs to disable lockdown and be able to attack mines and poachers. Alternatively, in the meantime, you can move your primarch to a friendly castle in a given region and attack the mines and poachers there.
6:15pm UPDATE: Players on v4.21 should now be able to access Atlas once again. May require a game restart to see the HUD button.
8:55pm UPDATE: Kingpin issue should be resolved and farmers should now be regenerating correctly