I am also not finding where I can re-enable it.
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Important note about SSL VPN compatibility for 20.0 MR1 with EoL SFOS versions and UTM9 OS. Learn more in the release notes.
I am also not finding where I can re-enable it.
What was previous firmware version? Make sure you not accessing device from LAN or DMZ, as CAPTCHA is not required from LAN or DMZ.
You can check current CPATCH config using following CLI option in Device Console. You can also use enable/disable option to update configuration.