Recently all my external tools stopped to accept grades from my assessment plugin.
I constantly received the message "imsx_description:Tool does not accept grades". I've been looking around and I could not be able to find a reason why this is happening.
I am attaching both the request and response I've been receiving and some scenarios I tried and failed to send the grade back.
My external tool configuration
Moodle Version: 2018051702.11
Release: 3.5.2+ (Build: 20181027)
Maturity = MATURITY_STABLE