I contacted Roku and got a refund through them.
Then I went to newsmaxplus.com and repurchased the subscription directly through there.
I received the email confirmation and invoice in which I am directed to access my purchase and register the account.
Clicking on the provided link I'm taken to the newsmax.com website where a popup shows up at the bottom (using firefox) which shows a green Start button. It advises that I should:
1. Click on 'Start'
2. Activate your account
3. Access your content.
When I click on Start I'm taken to the diganexa.com website where they check my connect speed, identify it as 'fast' and give me a Continue button.
There I'm directed to enter my email address and password to create the account. When I do so I get an SSL error and cannot proceed. I get a similar response using Microsoft Edge.
I'm not even sure the diganexa thing is legit or an online scam site, there are no indications that it's associated with newsmax+ other than it's on their home page.
At this point I'm not sure if I even have a newsmax+ account. I'll try to put it into my Roku later and see what happens.