S3 backups failing: 400 errors

Ubuntu 20.04.3 on DigitalOcean. Webmin version: 1.984 Virtualmin version: 6.17-3

Trying to run a backup job to S3.

The first virtual server it tries to upload gives me

nvalid HTTP response : HTTP/1.1 400 Invalid URI: isHexDigit

Then every other virtual server gives me

.. upload failed! Empty response to HTTP request. Headers were :

.. completed in 1 minutes, 25 seconds

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