Integrate GitLab server with Bitbucket via oAuth is not working

Hi Everyone

We need to import some projects from BitBucket to Gitlab 15.0.2-ee and as per the document Integrate your GitLab server with Bitbucket Cloud | GitLab We created the Consumer but I cannot find out what value should I enter for CAllback URL. So back in instructions,

Callback URL: (Required in GitLab versions 8.15 and greater) The URL to your GitLab installation, such as

https://gitlab.example.com/users/auth

we tried with “our” gitlab.example.com/users/auth or just gitlab.example.com but once we are trying to login via BitBucket button we get

Could not authenticate you from Bitbucket because “Unauthorized client: invalid oauth client credentials {“error description”: “invalid oauth client credentials”, “error”: “unauthorized client”}”.

If we try to skip the callback url, is not work at all. Can someone please help us on that?