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I found the solution. When you create the ID, you are not allowed to set the domain with a http or https prefix. But you MUST set the redirect uri with the prefix as you have to do it the same way in your code. This is clearly not visible in the console. Also, when you create the ID without the prefix and you want to remove the redirect uri and add the correct one with the prefix, Apple removes the prefix silently and you will still run into the same error. So the solution is to delete the ID, and recreate it with a redirect uri with prefix. Took me only 2 hours to figure this out.