If grbgetkey produces a message that looks like this:
info : grbgetkey version 9.0.1, build v9.0.1rc0
info : Contacting Gurobi key server...
error : ERROR 405: Cannot reinstall license xxxxxx;
get a new license from the Gurobi website
it means you are trying to install an academic license on a computer different from the one for which it was generated.
Please simply request a new license:
To request a new academic license, connect your computer to the university network, then follow the instructions for a named-user academic license in: