After a goalless first half Oak went on to win despite being reduced to 10 men.
Josh Brown and Marcus Scott put the hosts two-up before they had a man sent off.
Oak are now just three points behind leaders Conwy Comrades with a game in hand.
Wanderers had to forfeit an away trip to Conwy.
A club spokesman said: “We originally thought we had a free week but were given a fixture early in the week, Unfortunately, we couldn’t field a team due to most of the squad being away or taking extra shifts at work.
“We’re set to be fined and deducted 3 points, but we are considering an appeal as we’ve worked hard for the points.”
Maxie Williams hit four goals for the visitors, who ran up double figures in a cup clash at Rhyl.
Oliver Carey netted three, Harry Kirkham and Tyler Griffiths two apiece and Dion Lloyd a single.
Royal Oak v Conwy Comrades
Rhyl Rangers v FC Mally
Y Clwb v Prestatyn Wanderers
Darren Thomas (left) and Richard Davies celebrate after winning the 2025-26 Welsh Cup. Picture: FAW…
Goalmouth action from NFA (light blue) versus Kinmel Bay. Pictures: MATT JOHNSON NORTH WALES FOOTBALL…
Tillie Ashworth has an impressive football CV. Photos courtesy of Connah's Quay Nomads FC/Wrexham AFC…
Steve Gardner leads the way (red vest) Report by Don Hale donhaleblog.blogspot.com/2026coastandcountry.blog North Wales Road…
NFA (light blue) take on Kinmel Bay. Picture: MATT JOHNSON NORTH WALES FOOTBALL RESULTS -…
Kinmel Bay have signed highly-talented attacking player Antonio Jacovelli from Prestatyn Town. The speedy and…