It is myself Mandjoman replying to myself and anyone else having the same problem.
Wednesday (Australian time) when I had the above problem I stated that my My Passport Wireless Pro would not accept the password on the sticker.
I also stated that the Wireless Pro was fully charged - it was - at least I believed it was - there were no flashing lights. To ensure this I had the charger plugged into the MY P W Pro. In this configuration I failed to connect wi-fi.
I left the WD My P W Pro on charge overnight - now I’m really certain the W Pro is charged -
…so I disconnected the charger and tried to connect the wi-fi again.
The first attempt failed - I used AxxxLXON - O for Oscar.
The second attempt succeded - I used AxxxLX0N - 0 for number naught.
Deduction (euphamism for guess) …
Four solid blue lights means 75% charge + some - meaning - not necessarily fully charged.
Therefore My P W Pro was not ready to connect wi-fi…???
Having the charge cable connected and power supplied convinced the My P W Pro that is was not fully charged and not ready to connect to wi-fi.
My threats of violence and voodoo incantations worked.
In future my first problem solving option will be voodoo.