Smartthings Integration Issue - Unable to setup the smartapp. Please try it again

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My system is like below;
Intel NUC 11 - HA - ST station - iphone - ST app

(all the s/w, f/w versions are the newest)

I have been trying to integrate my smartthings to HA.

I use Nabu Casa to activate HA cloud and it works fine. >> url starts from https, instead of http

Also, I made my smartthings access token properly.

But when I try to integrate ST to HA, the error message (Unable to setup the smartapp. Please try it again) keeps on.

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Please help me to work this out. This makes me crazyyyyy…

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I am having the same problem. Total newbie. I have HA installed on HP t630, dedicated, no VM.
I have a Nabu Casa Account (Remote is on), and while trying to integrate Smartthings, I get the “Unable to setup the smartapp. Please try it again” error. Then, after getting a new Personal Access Token, deleting the older one, kept getting the same error.

I tried pip install hass_smartthings_remove on the HP, but got Error: unknown command “pip” for “ha”
Rebooted HA, went back to Nabu Casa, which asks for new webhook, so I tried the Smartthings integration again with the same result. The link on Nabu Casa goes to https://hooks.nabu.casa/…
On Nabu Casa documentation, it notes the link should go to: https://hooks.nabuca.casa, instead of nabu.casa, possibly a typo in the documentation.

Any help on this is most appreciated.

Also, at a dead end on integrating Google Nest, but that is for another day.

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I gave up on the Smartthings integration and got a Zooz 800LR Z-wave stick, and a Sonoff Zigbee 3.0 USB Dongle Plus (ZHA integration). Then, I migrated all my Z-wave devices and Zigbee devices (including all my Phillips Hue bulbs) to Home Assistant. Once that was done, I no longer needed integration with Smartthings (or Phillips Hue), so I disconnected both the Smart things and Hue hubs. After help from YouTube video “Finally! A WORKING NEST Integration with Home Assistant using OAuth!” by mostlychris, sent $5 Thanks, and completed the Google Nest integration successfully. I also subscribed to Nabu Casa Home Assistant Cloud. So I am now fully assimilated into Home Assistant, because resistance was futile.

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Congrats!! I’m still struggling with both of those problems. I think I’m going to keep trying for the Smartthings integration for a bit.

Any chance you remember which YouTube video helped you with the Nest issues?