OAuth authentication fails - redirect URI not supported by client

[Sorka1]

Description

After installing the Claude Terminal add-on and opening the terminal, I receive a link for authentication. When I copy and paste this link into my browser, I see the Claude authorization window. However, when I click "Authorize," nothing happens.

Error Details

Browser inspection shows the following errors:
[Error] Failed to load resource: the server responded with a status of 400 () (authorize, line 0)
[Error] [REACT_QUERY_CLIENT] – "QueryClient error:"
Error: Redirect URI https://platform.claude.com/oauth/code/callback is not supported by client.

Environment

• Home Assistant OS (or your specific installation type)
• Browser: (Chrome/Firefox/Safari - whichever you use)
• I have an active Claude Pro subscription

Steps to Reproduce

1. Install the Claude Terminal add-on
2. Start the add-on and open the terminal
3. Copy the authentication link provided in the terminal
4. Paste it into a browser
5. Click "Authorize" on the Claude authorization page
6. Nothing happens - button appears to work but authorization doesn't complete

Expected Behavior

Clicking "Authorize" should complete the OAuth flow and authenticate the CLI.

Additional Context

The error suggests that the redirect URI https://platform.claude.com/oauth/code/callback is not registered as a valid callback URL for the OAuth client being used by Claude Code CLI.

[mspnr]

I think I also tried to click button "authorize" a couple of times and nothing worked.

Then I noticed that terminal is asking about confirmation code and Claude indeed displayed some code. So I copied the confirmation code from the browser back to the terminal and pressed enter and then it worked.

[Sorka1]

I simply see this window when I copy the link from the terminal and open it in the browser.

[mspnr]

What do you see in the terminal? Is there in your request there? Like enter a code or something? It was for me.

What displays the browser after you click authorize?

[Sorka1]

Yes I see the link for the authentication which I copy and paste in a separate window. When I press authenticate nothing happens.

CleanShot.2026-01-20.at.20.07.14.mp4

CleanShot.2026-01-20.at.20.02.31.mp4

[mspnr]

I think you are doing everything right. The only thing what is confusing, why you clicked "Authorize" 5 times.

For the sake of checking. I logged out and logged in again.

On the step with displaying Authorize in the browser I clicked authorize once (!) and then I looked into the icon of the browser - a wheel started spinning indicating your request is processing. Maybe your Internet connection is not very fast or Claude servers are lagging. Anyway I would wait more than two seconds (maybe even 30 seconds) till the wheel stops spinning and not click authorize five times sending new requests.

For me after clicking Authorize a page with "Authentication Code" was displayed which I copied back to Claude Code and it went through.

[Sorka1]

That was just me showing extra hard how much it does nothing. Of course even when being patient, nothing happens. It’s like the button has no functionality, the browser does nothing.

[mspnr]

Sorry man. You are doing this right and your expectations are correct. This sequence worked for me here and in some other places. Maybe you can try another workstation or another operating system or another network. I'm not sure. Good luck with that!

[heytcass]

Hello @Sorka1!! There was an upstream bug from Anthropic last week that was causing issues with the redirect (I had the same issue with my desktop app). It should be fixed now that there's a new version out. Can you try again and let me know if it works?

[joesan-ha]

I'm having the same issue. The URL seems to break at around claude.com. If I copy it into Word and fix the formatting I can perform the linking step and get the numeric code from Claude but when I go back to Claude Terminal in HA, there's nowhere to post the code. I have a Pro account so would prefer to use that rather than the API route. Any suggestions on what to try?

[wesmannmsu]

Same Issue, there is no where to post the Claude Code once you get it from the website. Coming back to the terminal, does not allow you to impute the generated Claude Code into the terminal

[joesan-ha]

Update: The browser still doesn't load in the Claude Terminal window but I cut and paste the new URL into Chrome this time (ratther than Safari), went through the Secure Link to Login process, enter the numeric code, linked the account from there and received a long login code. This time I was able to paste the long code into Claude Terminal at the prompt and was able to start Claude. Might be an idea to document this process with a few screenshots as it does seem to have some room for misinterpretation.

[rseidens]

I am having an authentication issue with the OAuth request provided by the add-on. I get an error; Invalid OAuth Request missing the scope parameter. Has anyone experienced this? I am using the latest Home Assistant OS on a raspberry pi and trying to authenticate with my professional Claude account. I am within a Safari browser on my Mac all with the latest build.

[dethpickle]

@joesan-ha thanks! Switching from safari to chrome fixed it for me.

[rseidens]

I was able to cut and paste the link into chrome and after logging in and getting the code I could login properly. Thanks