"'redirect_uri' could not be validated" error attempting to get OAuth authentication code

[Andreas_Roedl]

Error: "redirect_uri could not be validated" During Login for Automation Project with Webhook

Hi SmartThings Community, I’m working on an Automation project using a webhook and have confirmed that my webhook URL is correctly set up. However, I’m encountering an issue during the login process where I receive the error: “redirect_uri could not be validated.” Here’s what I’m doing: I’m using the example from this GitHub repository: SmartThings API App Subscription Example. Instead of creating the app using the CLI and app.json, I manually inserted my own appId, clientId and clientSecret into .env. The webhook URL was confirmed as valid, but when I attempt to log in, the process fails with the redirect_uri validation error. Has anyone faced a similar issue? Any help or suggestions would be greatly appreciated! Thanks in advance!