for VSADMIN user in svm level create password on both clusters
clusterA::> security login password -vserver PRI_SVM-username vsadmin
Enter a new password:
Enter it again:
cluster::>
clusterB::> security login password -vserver DR_SVM -username vsadmin
Enter a new password:
Enter it again:
you may to Unlock the users at SVM
Example
cluster::> security login unlock -vserver PRI_SVM -username vsadmin
cluster::>
cluster::> security login unlock -vserver DR_SVM -username vsadmin
Then try to create peer relationship either in CLI or GUI