@leocg when i try to guess a possible password it says "invalid passphrase", i never created a passphrase

i use opera for 6 years, never set any passphrase, one week ago my OC totally broke and i reinstall it to windows 11, surely i don't remember my opera password so i recover it.... i have so many hopes on opera synk but unfortunately this thing ask me about passphrase?? what should i do in that situation. As opera say my passwords still on servers, a lot of passwords i can`t recover and it important for me please help me