Pulse Secure and Juniper parted ways a couple years back and at some point versions of the Pulse secure client stopped working across various platforms connecting to the SRX. Likely the version of Pulse Secure and windows you have is a combination that is simply broken for SRX and will not be fixed because the relationship no longer exists.
the current paid client partner for Juniper is NCP.
https://www.ncp-e.com/en/exclusive-remote-access-solution/vpn-client/exclusive-entry-client/
The open source client that some people use is Shrew Soft. I've not tried it recently but it has worked in the past.
https://www.shrew.net/home