We’ve been investigating this deeper. There appears to be a bug with the hub firmware which causes it to drop certain incoming messages from some locks after a new pairing. If your hub isn’t receiving unlock/lock notifications from the FE599 despite adding a buffering repeater and following all the steps mentioned in this post, you may be hitting the bug. ST has been made aware of the bug and they’re working on a potential fix.
Feel free to send an email to ST support (support@smartthings.com) explaining the issue and you can also reference ticket no 899130 in your email so they can tag them together to expedite the fix.
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