OsLoginRpcException - Username is not POSIX compliant error - os-login

[FredG]

Hello,

I am trying to learn and use compute engine.

I added a ssh key to os-login, and was able to log in to a newly created debian instance with my owner account.

On the shell command line the "tab" key was very slow.

I dug deeper, eventually sniffing traffic on port 80 with "tcpdump -A port 80"

My typing "tab" triggered the below http request that eventually timed out.

Please let me know if you know what is happening, and what I may have configured wrong.

Thanks very much.

GET /computeMetadata/v1/oslogin/users?username=%2A HTTP/1.1
Host: 169.254.169.254
Accept: */*
Metadata-Flavor: Google

HTTP/1.1 400 Bad Request
Metadata-Flavor: Google
Date: Tue, 14 May 2024 03:23:42 GMT
Content-Type: text/html
Server: Metadata Server for VM
Content-Length: 290
X-XSS-Protection: 0
X-Frame-Options: SAMEORIGIN

[ReqId=6186187641B96.A9BF166.74045544] Error Details: Username is not POSIX compliant.
com.google.cloud.oslogin.exceptions.OsLoginRpcException: <eye3 title='INVALID_ARGUMENT'/> generic::INVALID_ARGUMENT: [ReqId=6186187641B96.A9BF166.74045544] Error Details: Username is not POSIX compliant.