Sponsors portal sign-in error 500

[vanjo9800]

This year we have had quite a lot of issues with sponsors not being able to sign-in into the Sponsors portal giving them a 500 error.

For now I have only fixed Huawei's error which was that they were using the wrong link, but we need to investigate this. Whether this is a problem in Auth0, or something else.

I could not reproduce it on my side.

[vanjo9800]

I seem to have fixed it for HRT by adding a custom Exception handler of the Login controller here: 9cec469

But it seems to be a wider Auth0 bug as mentioned here: https://community.auth0.com/t/handling-laravel-callback-exceptions-invalid-state-and-cant-initialize-a-new-session-while-there-is-one-activ/45103