• sky Gong
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I've a Login with salesforce functionality enabled in my application. When I generate a login oauth url which consists of app secret and ket and after sending a get request using browser It redirects me to a previously used cache instance url.

It should redirect to https://login.salesforce.com/?ec=302&startURL=%2{someurl}

but instead it's redirecting to https://myinstance.salesforce.com/?ec=302&startURL=%2{someurl} although I'm logged out of salesforce and this url only accepts my login credentials which are linked with my instance where as login.salesforce.com accepts anyone's login credentials.

if I use incognito window it works fine and I've even tested the oauth url using postman the response is a html file which has javascript function which redirects to login.salesforce.com/?ec=302&startURL=%2{someurl}
Is there anyway I can solve this issue or force my oauth url to redirect to login.salesforce instead of cached url.
I'm doing the simple lightning components challenge and have hit this problem in my existing trailhead org and a brand new dev org that I've just created:

Challenge not yet complete... here's what's wrong: 
There was an unexpected error while verifying this challenge. Usually this is due to some pre-existing configuration or code in the challenge Org. We recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: QVWBQHAG