Duplicants Ignoring Yellow Alerts

how have you got your priorities set?  9 is soon as possible, so if you've got everything set to 9 then they'll just do the closest task to them. You have to prioritize what you want done in what order. if you set most of the tasks to the default 5 and have a few 9s and 8s then they will do those tasks first.

you can accidentally change the priorities by using the priority tool and selecting everything, the best way to do it is to use the radio buttons on the priorities tool (you can select dig, automation, building etc. instead of all of them)

Also are you sure its not a two tile space somewhere that is stopping them from getting to the yellow priority tasks ? The duplicants can only move or jump across 1 tile wide gaps.

Edited March 4, 2021 by marsnz

Having this problem as well, dupes won't build some power wire. The top priority task isn't appearing on their to-do list at all, so that seems to explain why the dupes won't do it. Reducing the priority to a number doesn't solve it. It is as if the build order just got thrown into a black hole. 

ETA:  cancelling and remaking the order entirely fixed it.  Turned out I was locally out of copper ore, but the notification flag that usually warns you of this didn't come up.

 

Edited March 6, 2021 by Void of Winter
Adding more info after experimenting

I've had this issue as well, dupes will walk right by something flagged as top/yellow and carry on, but if I cancel the task and set it to 9, they'll do it right away.  It's almost as if setting top/yellow is now akin to setting something below 5.  Just to test that theory, I made sure I had no tasks higher than 6 and reset all dupe priorities then set a sweep to top/yellow.  Let it go for five cycles and the dupes would just run right by it (it had a storage location nearby, so that wasn't the issue) - literally running right across the item.  Canceled the sweep and set it to sweep again with a priority of 9 and the item was swept in about ten seconds.

same here i basicaly cant play while this is going on because they wont bring the oxygen diffusers their algae, i realised it a bit late and now half my base is unbreathable the oxygen will only last 1 or 2 cycles; what ive done :

Set every other priority to 1; Set their prioritys all to standard piority; Sometimes they walk past it (they arent blocked by something); They would rather do the stuff with priority of "1" than "yellow alert"                                                             

Edited December 9, 2022 by valyval

2 hours ago, valyval said:

they wont bring the oxygen diffusers their algae

Can the oxygen diffusers work or are they blocked due to "max pressure"/not enough power? Is there any algae to bring? The priority for oxygen diffuser is "life support" iirc. Do you have it higher for some dupes?