When I tried to access my account, on the only computer I use, I got this message

[tbduval]

It looks like you signed in from a different computer. We’ll need to confirm your identity. Call us at 1-866-303-3229 and mention security code...

[shipscript]

If using a VPN or other IP anonymizer, or if traveling, that message would be likely to appear.

You can see your prior logins here (you'll be asked to sign in):

https://signinalert.ebay.com/sgninalrt/sessions

The phone number is valid for security verification, so go ahead and make the call.

You may be asked for:

1. Passcode
2. First four letters of username or email
3. Reason for call? Answer "Account Security"
4. Wait for agent