Microsoft has released KB5003646 on the 6th of June 2021. Part of this update is a security hardening measurement to align with recommendations as a conclusion out of CVE-2021-31958.
As a known issue of this KB5003646, microsoft has noted in the release notes: «After installing this or later updates, apps accessing event logs on remote devices might be unable to connect.»
This is exactly what is happening on Fortinet FSSO (FSSO with FortiGate, as well as FSSO over the FortiAuthenticator) and Palo Alto Networks User-ID Agent. They are not working anymore after the installation of Update KB5003646.