Had this issue myself when upgrading MSE from 18.104.22.168 to 22.214.171.124 with Prime Infra 3.4, WLC 8510s @8.0 and 8.3 , - no sync.
Several steps needed to fix it:
enable TLS v1.0 in MSE (via /opt/mse/setup/setup.sh) delete/re-add MSE in Prime enable R/W SNMP in WLC for Prime - then sync Re-added MSE mac address and SHA2 key to WLC (on one WLC only, 3/4 were OK)
Hope this helps others! Darren
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