This issue occurs due to the complete certificate authority chain is not properly installed in the Trusted Client CA list for the Pulse Connect Secure (PCS) device
In the Pulse logs, the following message will appear:
PulseTray Pulse p0900 t403 jamCert.cpp:364 - 'JamCertLib' Found 3 personal certs
PulseTray Pulse p0900 t403 jamCert.cpp:377 - 'JamCertLib' 0) Processing Certificate
[Subject: User XXXX, Issuer: "ISSUER NAME",
Thumbprint: XXXXXXXXXXXXXXXXXX] ...
PulseTray Pulse p0900 t403 osxCert.cpp:1443 - 'JamCertLib' SecTrustEvaluate() succeeded
with SecTrustResultType (5: kSecTrustResultRecoverableTrustFailure (like Cert may be
expired or something else))
PulseTray Pulse p0900 t403 jcSelectionRule.cpp:345 - 'JamCertLib' Certificate XXXX does
not meet the required 'is trusted by the server' condition, skipping it (rank 0)
If the error is present, this does confirm that the Pulse Secure Desktop client is unable to obtain the complete CA certificate chain from the PCS device.