When I share my outdoor plugs with someone in my house, they cannot power them on. Each time they try, the get “set failed” and it doesn’t work. The plugs work as expected for the owner of them, the person who shared them.
We deleted them from the app and reshared with the same results. App is up-to-date. Firmware is up-to-date.
One weird thing is the the "Activation Date - 12/31/1969
That ain’t right for sure.
No, that ain’t right. The only funky Activation Date I’ve noticed on any of my products (so far) is the date on my Video Doorbell v2 that precedes that product’s public launch date. 
Since you’ve already gone through the exercise of deleting the Plug Outdoors from the app, I wonder if trying to reset them (by holding in one of the power buttons for 5 seconds) prior to setting them up again would have any effect. I’m guessing it wouldn’t, but I don’t know.
One thing I think I’d do is replicate the failure (the error message) on a shared device user’s phone and then submit a log from that phone. Then, as the device owner, I’d open a ticket with Wyze Support that includes that Log ID and the information about the funky Activation Dates. Wyze Support personnel won’t have direct access to the log, but they should be able to communicate the ticket information to the appropriate developers and possibly give you information about that weird date.
I hope you can report back whatever you learn, because I’m genuinely puzzled by this one. Maybe another Forum member has a better idea.
I just discovered I too have this issue with a shared user. For what it’s worth and it may not be related, earlier this year after a firmware upgrade (I believe, can’t prove it) my schedule for my outdoor lights failed. I was using turn on at Sunset and then turn off at a specific time. After some testing I was able to get it to work if I assigned the schedule on the opposite plug (2) and it would turn my lights on connected to plug 1. As the outdoor plug is out of warranty, I will live with my fix. I wonder if the firmware update messed up a few features? I wouldn’t mind buying 1 but it is the issue on all 3 outdoor plugs
Welcome to the Forum, @petrolasalle! 
I just fiddled with a Plug Outdoor that’s shared to me, and I’m finding that I’m unable to control either socket when I tap into them from the app’s Devices tab. If I tap a socket and then tap the power button (e.g., on the Plug Outdoor’s SOCKET 1 OF 2 screen), then the app shows a “Loading…” message for several seconds without actually changing the socket’s state. I’m not seeing any kind of failure message, but that ain’t right.
I did find that if I 
the sockets on the Devices tab to add them to Favorites, I can turn them on and off there, and that seems to work reliably, at least in my limited testing. Also, I have no problems controlling a socket that’s been assigned to a home and room in the Google Home app (which is how I usually control them anyway, or, more frequently, just talking to Google Assistant to turn on/off the fan that’s plugged in). I don’t know if using something like Google Home or Amazon Alexa is an option for you, but at the very least you could add the sockets to your Favorites tab in the Wyze app and see if that gives you a better experience (assuming you’re using a current app version).
I would guess that you’re talking here about Local Schedules on the Plug Outdoor itself (from a socket’s main screen, tap 
Settings ➜ Schedules). Local Schedules are nice because they’re stored on and run from the Plug Outdoor itself, without relying on a constant Internet connection. Unfortunately, there’s a longstanding known issue with these, with most users who’ve experienced it reporting that a schedule will run on one socket but not the other. (I have not been able to replicate this myself when I’ve tested.) I don’t have any insight into Wyze’s efforts to address this, though I would expect it to be a fix-it-friday submission when those resume again at some point.
In the meantime, using a Schedule-type Automation (from the Wyze app’s Home screen, tap the upper-right 
➜ Automation ➜ Schedule) should be an option if your Plug Outdoors’ locations have reliable connections to your home Wi-Fi. I think that’s what a lot of users are doing as a work-around for the Local Schedules problem.
Thanks for the solution…It worked ! 
Yes I was taking about Local schedules I never considered Automation. Once again thanks for pointing me in the right direction.
You’re welcome. Glad I could help today! I understand that Local Schedules are probably the way to go for some situations, but if you have a reliable Internet connection, then I think Automations are perfectly viable in most situations.
I have the same problem for my shared user. iPhone, updated wyze app, always set failed and automation/schedules don’t work. User has uninstalled, reinstalled app, I’ve removed and added shared user back. Nothing. It just flat out won’t work. Wyze Outdoor Plug. User can control and add automation for bulbs, etc and they work. Frustrating.