So my ecobee went offline a few days ago and I cannot reconnect it or its two occupancy/temperature sensors.
The thermostat works fine using the ecobee app but in SmartThings and ActionTiles it is dead in the water. Trying to reconnect by adding back the ecobee credentials I get the following from the Classic app (in the V3 app it is a shorter message but essentially the same problem).
Is this the ecobee problem that occurs every few months that I have been reading about?
Hi, did you try to unselect the ecobee tstat from all your automation (routines, smartapps, scenes) and remove ecobee connect from your smartapps, and re-start from scratch?
I don’t have any issue with My ecobee DTH…
You should investigate…
Regards
I have done everything short of deleting it and reinstalling. That is next.
Did you get it connect? It did finally tell me that my credentials had changed in a firmware update. I did the new sms code for verification on my phone and on the website, but still won’t connect. I rebooted all devices without any luck.
I used the device handlers from SANdood in GitHub and all seems to be working for what I need.
I just went through this. In my case for some reason I needed to re-link or reconnect my Ecobee account to Smartthings. In my crude way I did this by deleting one of my Ecobee devices from my Smartthings app & then went to readd it. This forced me to reconnect my Ecobee account. As soon as I did that, all my Ecobee devices showed online. I even added an automation that when my van ecobee device detected motion for more than 30 sec’s, send me a text.
I got an error saying my ecobee had lost connection and I needed to go to ecobee (connect) to reauthenticate. I couldn’t find any such thing in the ST Connect app (since Classic is long dead now), but simply adding a new ecobee device to the same room triggered the opportunity to log in again with ecobee cred and the device was reauthenticated. No duplicates, no deleting and re-adding, which is typically painful in ST if you have a lot of scenes etc.
Terrible documentation with unhelpful message by ST, but easy solution in the end.
I had the same problem. Same message. It had been working fine for like 9 months. I deleted it from ST, deleted ST from Ecobee, and re-added all of it and it still did not work. I tried your trick and BAM, right back in business! Thanks.
Glad to be helpful! 
Had the same problem, ecobee went offline last night. Just now deleted the device from ST and added it back like new and it worked. Thanks.
I also lost connection to my Ecobee3 and three sensors. I deleted a sensor and this forced the re- authorization screen to pop up and in addition I had to update the Samsung Pass app. This app stores ids and passwords - I think that this maybe the source of the issue.
This tip still works. Thank you so much.
