In case this helps someone, this is how to setup remote admin using the iOS app. Node A is the primary node. Node B is the remote node.
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In the node A menu “Settings → Security”, manually copy and share (i.e.: send) the Public Key from node A to node B. In the node B menu “Settings → Security” , manually paste that Public Key into the field labeled “Primary Admin Key”. Click “Save” at the bottom of the screen. Of course you can manually type in the Public Key if you’re a glutton for punishment.
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On BOTH nodes A and B, turn on the “Administration” toggle found under “Settings → App Settings”.
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On node A in the “Settings → Configure” menu (which is only seen after turning on “Administration“ in step 1), choose which node you want to change (administer) the settings… that’s either node A (the default) or node B (the remote node).
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Still on node A, whichever node that you’ve selected in the “Settings → Configure” menu (previous step) will now be active in all the Settings menus of node A. If you choose node B to configure, you’ll see node B’s name listed on each screen of the Settings menus on node A.
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When done using node A to make changes to remote node B, remember to change back the “Settings → Configure” to node A. Obviously it’s important to pay attention to the name of the node your administering on the Settings screens.