Error in Creating win-back offers for my app's subscription

Hello,

Currently I want to create a win-back offer for my app's monthly subscription, but whenever I choose to select Offer type option, Free, and selects options from the list like 3 Days, 1 Week, etc. It is just showing error like,

We can't process your request.

Go back to where you were and try again. If the problem continues, contact us.

Where I am successfully able to create win-back offers for weekly and yearly subscriptions without any issue.

I am trying this from last 2 days, but getting the same issue everytime.

Please help me solve the issue.

Thanks

Error in Creating win-back offers for my app's subscription
 
 
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