$ cd $(mktemp -d)
$ go mod init example.com
go: creating new go.mod: module example.com
$ go get github.com/Azurefirstname.lastname@example.org
$ go list -m all
$ go version
go version go1.11 linux/amd64
@bcmills I don’t know if you’ve had a chance to look at this much yet, but do you have an initial guess or sense of what might be going on here, or maybe a guess around possible correlating factors, etc.?