A login redirect change usually breaks scripts because the old session cookie is no longer being set, forwarded, or accepted after authentication. This often happens when providers add:
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New sso flows
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CSRF Protections
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SameSite cookies policies
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OAuth redirects
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Cloudfares/bot checks
First inspect what changed
Open browser Devtools-network tab during login and check :
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Which browser now sets the auth cookies
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Whether redirects changed
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Whether the cookie name changed
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Whether the final download request mode needs:
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Bearer token
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CSRF header
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Refreshed cookie
Common issue is
login.example.com -> sets cookie
download.example.com -> cookie not sent