Access denied Enter network credentials

I got nowhere with all the suggestions below so raised a case with WD who quickly sent the following which immediately solved for the exact issue.For me this issue arose after upgradingto OS5 and with use of WIndows 10

Thank you for contacting Western Digital Customer Service and Support. My name is Bochra C.

Please try to do the 40 sec reset, also known as System Only Restore.

You can refer to the link below:

How to Reset a My Cloud (single bay) Device

https://support-en.wd.com/app/answers/detail/a_id/24022

Thank you for choosing WD Support.

Sincerely,
Bochra C
Western Digital Customer Service and Support
https://www.westerndigital.com/support

Ladies and gentleman;
After zillions of try i am able to solve the problem. Fisrt you shoul apply all the solutions thats told here. Afterwards reset your network. Again reconnect to network and activate netbios over tcp again. use credidentials under windows control panel and add NASNAME, nas admin username (admin if you havent changed) and admin password. Now you can map your network. Map the network as \NASNAME\FOLDERNAME (nasname is the name of your nas, and select the folder you want) you cant map withour folder. If system asks for password enter “admin” and admin password in the dashboard as you entered credidentials.

Thats all.