This is your GPG Signing Key: CD665CBA0E2F88B7373F7CB997203C7B3ADCA79D.
The Signing Key is Weak because SHA1 encryption was considered completely Broken around 2020.
So nobody should like SHA1 in 2026.
Please Update the GPG+SHA1 Signing Key to GPG+SHA265 (or something else Debian Accepts.)
Otherwise Nobody will be able to autoupdate Plex (on Debian) Starting February.
Sorry for my bad English.