mine works for my personal google account, work one is sso and doesn't have it enabled. otherwise gh, aws, auh0 support it, I'm forgetting some others I use. beyond that you can generate 2fa codes too

Setting up: https://www.yubico.com/setup/yubikey-5-series/

Supported services: https://www.yubico.com/works-with-yubikey/catalog/

Google Accounts (for your gmail): https://www.yubico.com/works-with-yubikey/catalog/google-accounts/

I use yubikey everywhere it's available for me. Initially, the first few websites in the early years were challenging. I think a lot of devs were still trying to figure out the workflow.

But today, it's usually as simple, or simpler, than TOTP.

So it might be worth trying again. I'd use a YubiKey 4 or higher if you can. If you have an older one, you may want to upgrade to take advantage of the newer technology like NFC and Bluetooth if you're into that.

I just wish YubiKey could store more than like 30 TOTP tokens.

Sounds like a skill issue.

Have had yubikey for a few years. It was a pain to set it up initially, but it took me less than an hour if I remember correctly. Since then the only issue I have is that sometimes I accidentally bump into it and it pastes an OTK to a random place.

I use mine with AWS.