Have you seen the following AKN article about this error:
https://knowledge.autodesk.com/support/3ds-max/troubleshooting/caas/sfdcarticles/sfdcarticles/Error-...
On this AKN page, there is a troubleshooting form. Have you seen this
https://autode.sk/32xqOyu
We want to make sure you have the Licensing update installed:
https://knowledge.autodesk.com/search-result/caas/downloads/content/march-2020-autodesk-licensing-se...
Direct link to the update:
AdskLicensingInstaller-win-12.1.0.7121 installer file.
https://knowledge.autodesk.com/sites/default/files/file_downloads/AdskLicensingInstaller-win-12.1.0....
We also want this update:
Autodesk Single Sign On Component 2020.1:
https://up.autodesk.com/2020/ADSSO/A97BF60C-1A84-42CF-865F-FADC3E0E8DBA/AdSSO.msi
We also want to make sure all of the Autodesk updates showing in the Autodesk Desktop app are installed .. for both AutoCAD and Autodesk products (licensing)
Mike
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Mike Davis