Community edition - Key from automated email is rejected

After forgetting about Delphi for a long while, due to persistent installation issues, I decided to give Delphi another go to see if it works. And now it installs fine, but my key for the community edition is rejected by the program, with the following message:

 No valid license information found for Embarcadero Delphi 10.3. You must provide a valid serial number in order to use Embarcadero Delphi 10.3. Do you want to run the registration wizard again?

What should I do to activate the software?