Check that session is valid before attempting to open

[wulfmann]

The signin token creation process does not seem to actually require a valid session. So right now if you attempt to launch a session, it won’t fail until you get to the browser.

It may be worth adding a get_caller_identity call before creating the signin token to fail earlier.

[DanB288]

Hey @wulfmann !! , I would like to work on this issue👍

[wulfmann]

Sounds good @DanB288 let me know if you need any help!