what size for Drain hose extension for the washing machine

[yikman]

I have a Samsung washing machine - WW80M645OPX

I require a drain hose extension. I bought the Washing Machine Drain Hose 2.5m x 21mm which i got from screwfix - https://www.screwfix.com/p/washing-machine-drain-hose-2-5m-x-21mm/71062?tc=CB6&ds_kid=92700055281954...

I was told it is incorrect size as the hole is too big to connect to the washing machine extension cnonected to waste hose on the washing machinewashing machine connector and extension connector

i have looked at this: 

https://www.partmaster.co.uk/samsung/washing-machine/universal-washing-machine-dishwasher-25m-waste-...

Not sure if it is a correct size.

Can someone guide me what extension i require to buy?