I don't know of any issues. What site are you looking at?

Looked at thetrainhacker.com which took you to Klook but after checking again for x2 seniors I find it is coming up more than Eurail itself.

Site 2 was news.com with a 45% off making seniors cheaper so that may be my best option as it is for 10 days over 2 mths Pass. Hope that this offer can be honoured!

The only question you should ask is how these web pages do earn money with their not working / not necessary coupons.

Answers subject to availability.

And no, you won't get 45% off. I assume there will be no availability. 

It looks like this page:

https://www.news.com.au/coupons/eurail

The link for the 45% discounted passes just leads to the general page with Eurail passes:

https://www.eurail.com/en/eurail-passes

That won't result in any discount.