Everybody is experiencing this issue lately. You must reach out to the educational support team for resolution and run your product in 30 day trial mode until it is resolved. You can download your product using Autodesk AVA (unless its the 2020 version).
https://www.autodesk.com/education/support/edu-contact-us-form
https://ava.autodesk.com/ (follow download links).
Autodesk has indicated the follow information in other postings.
This error message is related to a corrupt educational account, that the educational support team many need to assist you with. If it is not a severe account issue the other solutions are listed below:
Try going to Education Community <https://www.autodesk.com/education/free-software/featured> instead of signing in from top bar, please select the application first that you want to download. Then, click on Sign In you also may need to log out and re-login again, using the same method.
In addition, we request you to clear cache and cookies and re- try using a different browser like Firefox or Chrome.
Also try resetting your account or create a new one.