Key provided but cannot decrypt wireless packets

Hi,
I'm working on a case for a Hospital and seeking advice as client is pretty unhappy with lack of resolution.
Cisco 5508 WLCs HA-SSO running latest 7.6.130. Cisco 3602i APs.
After an upgrade to the WLC code some time ago and/or network upgrades, the client's wireless pump devices stopped communicating. We have capture from NetMon v3.4 and capture shows the pumps de-authenticating, but TAC claims they cannot decrypt packets even though key was provided and we can login from a laptop with that same key no problem.
Any observations, suggestions, recommendations appreciated.
Thanks

Symptom : Cisco WLC using Releases 7.3 and 7.4 fail authenticate One Time Password (OTP) users when attempting to authenticate to the Cisco WLC using TACACS+. The following debug output is displayed when the debug aaa tacacs enable command is entered on the WLC CLI:
TPLUS_AUTHEN_STATUS_GETPASS auth_cont get_pass reply: pkt_length=25 processTplusAuthResponse: Continue auth transaction No auth response from: <SERVER IP> retrying with next server Preparing message for retransmit. Decrypting first Forwarding request to <SERVER IP> port=4900 AUTH Socket closed underneath No auth response from: <SERVER IP> retrying with next server Preparing message for retransmit. Decrypting first Forwarding request to <SERVER IP> port=4900 AUTH Socket closed underneath Exhausted all available servers for Auth/Author packet
Conditions : Cisco WLC using Releases 7.3 and 7.4; TACACS+ used for Management User Authentication; OTP used for TACACS+ static passwords are not affected.
Workaround : Extend the TACACS+ Management Server Timeout value by entering these commands:
config tacacs auth disable server-index
config tacacs auth mgmt-server-timeout server-index
config tacacs auth enable server-index

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Key provided but cannot decrypt wireless packets

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