Cannot replicate collection-publisher's MySQL database

[unoduetre]

Actual

~/govuk $ cd govuk-docker
~/govuk/govuk-docker $ grep adapter ../collections-publisher/config/database.yml
  adapter: mysql2
~/govuk/govuk-docker $ gds aws govuk-integration-poweruser ./bin/replicate-mysql.sh collections-publisher
~/govuk/govuk-docker $ gds aws govuk-integration-poweruser ./bin/replicate-mysql.sh collections-publisher
Enter MFA code for <REMOVED>: <REMOVED>
Replicating mysql for collections-publisher
couldn't figure out backup filename in S3 - if you're sure the app uses MySQL, file an issue in alphagov/govuk-docker.

Expected

Mysql database populated.

Comments

I am a new developer for GDS, so I might now know that it is not supposed to work, so my assumption it should might be wrong for some reason, please let me know. Replication works for other databases I use.