redirect Url in PostSendOption for POST /agreements/{agreementId}/views Not working

Support Team,

We are retrieving views from API POST /agreements/{agreementId}/views
We want to redirect user Post send. We have tried to set redirect url in PostsendOption but its giving error of
Specified post send redirect URL not in allowed list -
So where can we define the allowed list?
we have developer account can we define it in any settings?
Our redirect url will be like below
https:\\hostname\da2\Process\AdobeAcrobatSignDocument.aspx

can you help us with this being set?

Promt Reply will be appreciated.

Thanks alot,
Sanjay Parmar