Multi-arch builds are not working anymore

Since a couple of weeks, s390x, ppc64le and arm64 builds stopped working for me, e.g. on https://app.travis-ci.com/github/huth/qemu - I only get the error message:

Builds have been temporarily disabled for public repositories due to a negative credit balance. Please go to the Plan page to replenish your credit balance or alter your Consume paid credits for OSS setting.

However, according to the docs, e.g. https://docs.travis-ci.com/user/multi-cpu-architectures/#partner-queue-solution , the non-x86 builds should be still free of charge. So why is this not working anymore? Can this somehow be enabled again?

Is anybody else experiencing the same problem, or is it just me?

In case anybody else runs into this problem: I’ve got it sorted by writing a mail to the Travis support team (big thanks to them for the quick help!)