@David-TP Swapping the units following the directions from the first link worked. I have 3 APs and one of them wasn't using any ports so I swapped the main with it and everything came up as expected. Thank you 🙏 

However, that isn't a fix but a workaround. Also, it is likely that whatever cause the port failure will happen to the newly replaced unit based on the comments and number of people that had this same issue occur around the same time but not related to any change. (e.g., firmware update) It could be from the firmware but takes time for the port to fail. We shall see. I'll post back if it happens to the new unit.

  @Akra5ia 

Thanks for sharing. My concern is that it took a few months to happen the first time and if there's something defective in the hardware, I want the issue to be fully resolved while still under warranty. Swapping router hardware is on my list of least fun things ever, so not a good taste for my first tp-link router.  My previous Asus router lasted over a decade without any hardware issues...

  @Insaneoctane I am with you. That is why I bought mine at Costco. :) Do a backup and restore of the config. (100% on least fav thing to do, though)

  @Akra5ia 

I can't find the backup/ restore options in my Deco app.  Any help appreciated. 

@David-TP 

Hi David,

I just ran into the same weird issue with Eth port 1 not being able to come up properly. 

I used the work around to promote another unit to Main and it seems to currently have all ports functioning but as others have stated, seems like it could be a matter of time till port 1 on this unit fails. 

Any thoughts?

  @David-TP 

Hi David, 

April 2022, so looks like I'm still within the 2 year period, yes?

-mc2u

  @JohnD-23 TP-Link replaced my defective unit so I'd give that a try for yours.