Here are the posts I flagged before today:
https://stackoverflow.com/questions/60588457/multi-authentication-problems-in-laravel/60933363#60933363
https://stackoverflow.com/questions/60368024/how-to-make-laravel-6-authorization-that-checks-for-4-different-usertype/60851144#60851144
https://stackoverflow.com/questions/60796530/how-to-create-multi-auth-in-laravel-6-step-by-step-whats-the-purpose-of-middlew/60850756#60850756
https://stackoverflow.com/questions/60762126/how-to-create-multi-auth-in-laravel-7/60850459#60850459