Thanks for this link that finally got it to work again. 
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Yes 100% the test version of the app.
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Seems to be working again 
THX
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testversion no result here. Still not working. Uninstalled the app completely and aded the test version. stil 406
de installed the app en re-instaled via provided link. stil 406
Tried the mandatory things when things are messed up, like rebooting Homey, the Netatmo Relay, router etc? If so guess the conclusion is that the test version 5.6.5 works for some and not that much for some. Hopefully Athom/Netatmo is able to make it work for all, without breaking it again for those where it now works 
At least they seem to be on the right track to get the problem fixed (whatever is causing it).
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Can confirm that 5.6.5 version works.
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Seems to work for me, using the provided link! Thanks!
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5.6.5 fixed the issue with my valves using Homey (cloud based). I just upgraded the regular version to the test version without uninstalling anything. I didn’t need to repair or re-add the thermostatic valves.
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5.6.5 testversion also fix for my Netatmo valves. Big thx👍🏻
You have to use the App Store in a browser. It’s not possible to install a test version within the Homey app. So please follow this link: Netatmo App for Homey | Homey
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Thank you very much! It works again!
I also do not have thermostatic valves. I only have that thermostat module. and it still works fine. I can only no longer get into the options menu via the Android Homey app. On the computer website app it still works, while that was not a problem before. before the update.
seems that after a few times install, un install or just repeat installing the app using the above provided link the valves ar working again. I’m still testing
Yesterday when I changed settings at one valve, the second valve gave the 406 error. but now I can change all 5 without the error
in the test version v5.6.5 everything works fine
Still not working here. Still 406 error when changing temperature on the valves. When going into the settings: “an error has occurred. Please, try again”. When i try, the app gets stuck.
Hi @Zuidveen From Homey Web, can you follow the link below and send us a screenshot:
Hi,
My netatmo weather station seems to disconnect without notice very often. I can’t see the trends then because it only shows a long flat line since last de-connect. If i repair all is okay again. I get no notification of the deconnection. Is this a known issue? Can i make a flow that checks conection and repairs when necessary automatically?
Thanks for advice,
Dick Hissink
@Doekse FYI: Since the release of the test version, my smart valves were working again. However, this morning it stopped working but this time with a different code - Invalid token 403. After uninstalling the app, installing it again and re-adding the smart valves it is working again for now. I didn’t change anything on my Netatmo account for months.
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