The hardest part to activate eBay 2FA is to found the right URL. Here you are: https://scgi.ebay.com/ws/eBayISAPI.dll?ActivateSecurityToken
I didn't know that I could activate eBay 2FA using the Symantec VIP Access softkey (https://m.vip.symantec.com) because the eBay page states the hard token as only option. You need to use the VIP Access Credential ID as the hard key serial number and wait for two timed Security Codes to use as OTP.
But I found a even better alternative: https://github.com/cyrozap/python-vipaccess is a python FOSS "implementation of Symantec's VIP Access client. It is able to generate OATH URIs and their corresponding QR codes so any TOTP-generating application can be used as a VIP OTP token."
You don't need two apps. You can generate a QR code and register it in an app like Authy or Google Authenticator