TimeCapsule failure with Catalina

Have this week purchased a WD My Cloud EX2 Ultra. Bought the item following the failure of my Apple TimeCapsule. WD product selected as a TimeCapule replacement ++ based on WD marketing information.

Able to create a back but verification immediately fails. Backups are therefore unusable.

Same problem with iMac and MacBook Air. Both connected to LAN via Ethernet cables. Both Macs running Catalina 10.15.5. Firmware version is 2.31.204

Message received is “
‘Time Machine completed. A verification of your backups on “Wdnas”. To improve your reliability, Time Machine must create a new backup for you. Etc”

Need to get this working.

Any ideas?

Thanks.