Trouble Logging in with Safari

Safari requires you to first set up your google account within "Internet Accounts"

1. System Preferences, Internet Accounts,

2. Click the "+" to add an account, and "Google" in the right-hand column.

3. When the "goto Safari for authentication screen" returns, click [Safari].

4. This will take you to a Google authentication screen within Safari, that will ask you to authenticate".

More details here:

https://support.google.com/accounts/thread/15114226?hl=en