Once storage policies are created on both vCenters, log into Site Recovery Manager and clock on Site Pair > Configure > Storage Policy Mappings then click New.
Select a policy on the first vCenter to map to a policy on the 2nd vCenter.
Then click Add Mappings to choose the pairing and click Next.
Select the pair again to create a reverse mapping on the second SRM server for that policy pair.
Click Next then Finish to commit the bi-directional pairing.