@Don.M 

Go into the app settings of the Deco and Kasa, and make sure the location permission is enabled.

Another thing to try, power down the HS300 so the plugs appear offline, now try and edit the names/location. Once that is done power the HS300 to see if the names remain.

The location permission was / is turned on for both apps. I enabled 'storage' permission for the Deco app, but it still won't save the information. The same error message shows up.

I don't know quite what you mean about editing the names in the app - the Deco app doesn't show the HS300 at all (another one is shown, but not this new one). The Kasa app has the names and locations correct, it is only the Deco app that won't accept them. They show up as 6 new devices when I say I want to add (a) device, and then I go through each of the six outlets and assign the location and correct the names where a shorter name is using the rest of the previous longer name. When all 6 have been done, I click Done and get the error.

When the power strip is unplugged, it doesn't see any new devices to be added or modified and the correct names that Kasa shows are not shown.

I did also recently (this week) add three more Kasa wall switches. When the HS300 is plugged in, the Deco app sees all of them to be added but fails. By unplugging the HS300 I was able to add the HS200's and HS220. Then re-plugging in the HS300 it still fails to add.

@Don.M 

Which mode is the Deco running in? Router or AP Mode?

Please provide a picture of your device list showing what you describe when the Deco sees the plug along with a screenshot of the error.

The Deco is in Router mode.

I had tried to capture the screen showing the error message but it goes away when I open the notification panel to get to the screen capture button. It also goes away on its own after a couple of seconds. Oh, I did manage to capture it (on one of the repeats, which I left without updating the location).

Here are a few of the screens (not all of them).

Oops. I'm limited to one file attachment. I'll do multiple posts.

@Don.M 

@Don.M 

@Don.M 

@Don.M 

One last photo. @Tony , you asked for a device list. The HS300 only shows correctly in the Kasa app, but the only place the Deco app shows it is the in the screens I've posted above.

@Don.M 

If possible, please DM me the following information:

-HS300 hardware version, MAC address, your TP-Link ID

-Also, try and add the HS300 again, if you get the error again tap on the top three lines icon, go to Help > Contact US > Suggestions > Check Add System Logs > Submit.

I DM'd and did the Contact Us log submission, too. Hope there is some nugget in the log that let's you solve the issue.

Don Miller