Problem to register Onlykey in Google 2FA

I am new and just got my Onlykey ,
I try to register my Onlykey in Google 2FA
I saw a message say:

Are you there? Take action on your security key to sign in

What action do I need to take?

it is different with Yubikey

Please help

Did you follow the setup instructions -

Touch any key on the OnlyKey