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Dear developers,
unfortunately there is an issue with the Decoupled Flow. All Decoupled requests are ending in the Redirect flow at the moment due to unavailability of the Decoupled flow. This is affecting both PIS and AIS.
We are working on a fix with high priority and will provide a fix by the end of the week.  
Thank you for your understanding and we apologize for the inconvenience.
Your Commerzbank Support-Team