Change Primary Member On DFS Replication Group

First, you need to know which member server is acting as a primary member of a replication group. From which other member servers will consider this server which would have the authorized data to replicate.

Command
Dfsradmin Membership List /RGname:<replication group name> /attr:MemName,RFName,IsPrimary

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Once you will get the information about your primary member status of a dfs replication group. Then you device to which member you want to be act like as a primary member.

Command

dfsradmin Membership Set /RGName:<replication group name> /RFName:<replicated folder name> /MemName:<primary member> /IsPrimary:True

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Run "Dfsrdiag Pollad" to update AD records.

Thank You