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You receive the error "Sorry the URL or some of the parameters are not valid" when enabling "Adding a reason code for Subscription Cancellation is mandatory" under Reason codes > Subscription Cancellation.
This error usually occurs when the cancel subscription and reason code settings are not published under Checkout and Self-Serve Portal configuration.
Step 1: Go to Settings > Configure Chargebee > Checkout & Self-Serve Portal in the UI.
Step 2: Check whether the cancel subscription setting under Portal is turned ON or OFF.
Step 3: Verify that the settings are published.
Step 4: If the settings are not published, publish them and try activating the reason codes again.
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