Setting DISCOURSE_MAXMIND_LICENSE_KEY breaks docker image/container build

Installation
16

Continuing the conversion from over here.

I updated app.yml to include the account ID

Now I see an error when I rebuild (tests-passed):

****************************************************************************************************
MaxMindDB (GeoLite2-City) could not be downloaded: 400 Error
****************************************************************************************************

Message

MaxMindDB (GeoLite2-City) could not be downloaded: 400 Error

Backtrace

/var/www/discourse/lib/tasks/maxminddb.rake:83:in `rescue in block (2 levels) in <main>'
/var/www/discourse/lib/tasks/maxminddb.rake:70:in `block (2 levels) in <main>'

Any ideas what this may be?