1、Use the dfx wallet --network ic add-controller <Principal ID> command to add the “Principal ID” as the “controller”；
2、Use the dfx wallet --network ic addresses command to query the success of the addition；
3、But when querying at https://nns.ic0.app/, it shows “you are not the controller of this canister and cannot access its details”
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Got the same problem. Setup the canister under the default identity then added my previous principal id to the canister as described above. No access via NNS.