Dear Samsung Member,
Greetings from Samsung Customer Support!
Please perform the below mentioned steps to resolve the issue:
* Reset Network Settings: Go to apps screen >Settings >General Management >Reset >Reset Network Setting.
For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).
Thank you for writing to Samsung.
Samsung Customer Support
Almost every M51 user is facing this issue. We are unable to connect to Wi-Fi from M51. Two of my friends who bought this weekest monster M51 are also facing the same issue.
Three of us have replaced the M51 but still stuck at the same issue.
Also, contacted Samsung technicians, they took control of the phone through remote login and even they are unable to fix it.
To the surprise, Samsung is not even acknowledging this issue. Tried getting intouch with them through their official handles FB, Insta, Twitter but all in vain.
Now, I'm in touch with the known YouTuber, he's testing the phone & if he also verifies the issue, he'll highlight this issue on his next video :)
Only then Samsung will wake up.