Description
What is your problem ? A description of the problem, not the solution you are proposing.
As tested with Google OIDC, when a user opens my SQLPage website with SSO for the first time, they are immediately redirected to a "sign in with google" page hosted at https://accounts.google.com/ . This is a little jarring as they expect to see my webpage. Instead, they may think something has gone wrong because they are not at my website but somewhere completely different.
It also may be required in some jurisdictions for the user to actively consent to the use of cookies.
A clear and concise description of what you want to happen.
It would be nice if there was an option to create a page for a user for whom SSO auth has not (yet) successfully completed. They can be informed of what will happen when they click something like a "login" button to trigger the redirect. This could also be notified that by proceeding, they are accepting cookies.