Sorry David
I just found my question is a duplicate. So, if anyone reads this, if you use 2miners for mining, use your external IP at port 3415 http://xxx.xxx.xxx.xxx:3415/
and not a grinnbox address which expires after 24 hours as explained by @david If you have grin stuck at the 2miners pool, contact their support and provide them with the url of your external IP4 addres.
See here the original post with answer
Very new here. Hi. And help