Issue with OAuth Web Server Flow - 'Sorry, there is a problem with the service'

We have successfully created an application with Companies House and generated a Web key to access the APIs.
However, when initiating the OAuth web server flow using our Client ID, we are encountering the following error: “Sorry, there is a problem with the service.”

We have reviewed similar issues discussed in the forum (URGENT - Not able to connect to the API ), but unfortunately, we have not been able to resolve the issue.

Below is the requested user authorization URL for your reference:

Could you please assist us in troubleshooting this issue?

Thank you for your help.

Hi, I have logged this issue with our IT team. I will let you know once I receive a response.

Hi, is this error still occurring please?

Yes, We have a still error.

Please find the key details below:
Key type : Web
Key name : test.acoflow

Let me know if you need any additional details, or feel free to email us at prashant@getmyt.com

Hello,

The IT team have asked if you could try again.

If the issue persists, please take a screenshot of the error screen and attach it to this thread.

Thanks,

Ioan

Thank you,

After calling the OAuth2 endpoint in the sandbox environment, I was redirected to the Companies House sign-in page. Since I didn’t have an account initially, I created one using GOV.UK One Login.

URL : ‘Sign in to Companies House - Companies House - GOV.UK’.

However, when I tried to sign in, I encountered the following error:

Error: There is no Companies House account that uses this email address.

Could you please look into this and advise on how to resolve the issue?

Best regards,
Prashant