License key empty or invalid after save config on backend?

The issue from magento 2.3.2 and above with module Lof_All, Ves_All

To resolve it, just download new version of Lof_All, Ves_All and update for your site:

Please download the module Lof_All at here:

And Ves_All at here:

Then setup update for your site.

Run commands:

rm -rf generated/code/Lof/All

rm -rf generated/code/Ves/All

php bin/magento setup:upgrade --keep-generated

php bin/magento cache:clean

Then go to admin to verify license key again, after save the config you should go to the cache management and flush cache again.