Thanks for your reply.
First of all, I've tried using both links and it doesn't work,
I've tried deleting my history and cookies. I've also tried on Safari, Chrome, MS Edge - same result. I've downloaded the app and tried to register on there same result. I've tried it on my Macbook Pro, my Microsoft Surface & my dell desk top computer at work. Same result.
I must have wasted at least 3 + hours trying to register over the last month. I've tried every password under the sun (and I get a message saying my password meets requirements).
First few attempts I typically get this at the beginning

I keep trying and eventually, I get the dialogue box to choose a password which I do
Then it doesn't matter which password I choose I get this:

I'm at my wits end with it now. Should be such a simple thing to do but it just doesn't work. it's clearly some technical problem.
Thanks again for your response. Any other ideas?