using my login email and password as username and password. but showing error, also follow other steps, and other informations are correctly.
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The title of your post "getting auth errorError: Unauthorized, using my login email and password as username and password" suggests that the earlier comment in this thread may resolve your issue:
The userid you used to sign-up for access to the developer will be the user id of the tenant admin of the tenant concerned. However, the password will not be the same ... it is local to the tenant. So you will need to obtain a tenant password for this user.
One of our moderators posted this guide that may help you further.
Please review this comment on a similar thread and advise if it resolves your authentication issue:
In addition, this comment may assist:
tried all the methods but still not working
I'm assuming you are trying to connect to a deployed app and not to an Organization. If indeed trying to log in to an app with client credentials, you can try the Developer Workbench, as this takes away any fiddling, except for the need to have a working user/password, and a correct tenant id + client id. It is also very useful for debugging/testing/developer work in general. Alternatively, you can also test with Postman (as per the developer tutorial).
The issue is resolved now.