Error creating user when starting up a container

[that_guy_guy]

I'm trying to start up a container on a compute VM, running a Ruby on Dails Docker image. I haven't succeeded yet.

As it spins up, I get the following error in my logs:

{
"insertId": "1rtukjkf4oh1jr",
"jsonPayload": {
"message": "Error creating user: useradd: invalid user name '272753671180-compute@developer.gserviceaccount.com': use --badname to ignore.",
"localTimestamp": "2023-07-26T16:46:48.3703Z",
"omitempty": null
},
"resource": {
"type": "gce_instance",
"labels": {
"zone": "europe-west2-c",
"project_id": "sodium-woodland-389013",
"instance_id": "3600874612426863370"
}
},
"timestamp": "2023-07-26T16:46:48.370463992Z",
"severity": "ERROR",
"labels": {
"instance_name": "omnivore-demo-2"
},
"logName": "projects/sodium-woodland-389013/logs/GCEGuestAgent",
"sourceLocation": {
"file": "non_windows_accounts.go",
"line": "144",
"function": "main.(*accountsMgr).set"
},
"receiveTimestamp": "2023-07-26T16:46:48.857619465Z"
}

So far as I can understand, it never even gets as far as running my image.
Is this the host VM that's going to run the container?
How do I fix it?

Thanks,
Guy