I’ve found two that work but one is playing up, just append your key where there is [KEY] and save the shortcut

https://totp.danhersam.com/?key=KEY

https://2fa.zone/2fa/KEY (broken but https://2fa.zone/ works)

Example: https://totp.danhersam.com/?key=7J64V3P3E77J3LKNUGSZ5QANTLRLTKVL

And that’s why I use a url on my desktop to a 2fa generator that also decodes it with the 2fa key as an argument. It’s like a password sticky note on the monitor, but for 2fa haha.