On the vSphere Client, import OVA file to Content Library fails with below error:
The Signing Certificate used for signing the currently available OVFs during the import process is expired.
As a result of this, OVA imports using Content Library will fail.
This is a known issue. Broadcom engineering is actively working on a fix in a future 9.x release.
Related to Broadcom KB's:
"The Certificate is Expired" warning for Skyline Health Diagnostics OVF deployment.