Hi platinum4,

It looks that the problem is not the command line. We tested it with our worker and it is OK.
Your worker name and ID should also be OK, otherwise the error owuld be something like " worker not authorized: platinumstephen.000000".

So we think that the problem might be at Pool configuration @ miningrigrentals website. Did you check if the field we mentioned before was left unfill?
When adding the pool in "Pool Configuration" tab leave "Pers value (-pers)" blank. See example in image  https://i.ibb.co/bRTP7Lk/image1.png

Could you confirm this?
Cheers