Here is a review of this notorious error code, not just as a software bug, but as a case study in the friction between creative tools and corporate control.
If your license files are corrupted, you may need to reset them to force a fresh login: How to change or reset a license for Autodesk software autodesk license status 2100 hot
15:23:01 (ADSKFLEX) HOT: license 85600ACD_2019.0F held by host123 (PID 8842) for 08:23:01 Here is a review of this notorious error
Some corporate networks or security software block or alter the communication packets between your machine and Autodesk’s licensing servers. If the data is modified in transit, the server marks the license as suspicious ("hot"). not just as a software bug
Corrupted local cache mimics a server-side "Hot" error.