For finger to work remotely, you have to have set up a .plan file as well as applied correct permissions to it at the time in your home directory.
I have a .plan file, I get that response from finger when I'm on SDF but it doesn't work when I do the lookup remotely. I don't recall the needed permissions.
$ finger chance
Login: chance Name: Chance Platt
Directory: /sdf/arpa/af/c/chance Shell: /usr/pkg/bin/bash
On since Sun Jun 9 09:56 2024 (UTC) on pts/19 from 99.162.15.208
Mail last read Sun Jun 9 09:48 2024 (UTC)
Plan: I'm friendly-like.
Now, since you know your username, there is a password reset mechanism:
You know what, I just checked, and account expiry is covered in the FAQ.
It might well be expired.
I second emailing membership, they might be able to help you. Or if you trust one of us, we might be able to check, as well.