Thought I should post the final outcome. WPsupport informed me that the problem was my MSA (Microsoft account) name. I was using an "illegal keyword that was being blocked by the system". Even though, there was no warning/error when I created the account, it worked over 9 months until i switched to WP8 on my L920, and only ended up blocked after 30 days active on WP8.
Obviously, WP8 and the MSA system implemented new rules at some point.
Anyway, the solution was to establish a new account and start over. Been up and running ever since.
Thanks for all the suggestions.