error

Percent signs and a good many other special characters give trouble with at least the rv.net portal.

Percent signs will post properly on the rv.net portal if you change the URL to a secure (https) url. Other characters can be posted as HTML character entities, but I don't think it's generally worth the effort to do so.

You could be using nonpermitted characters..
Your post regarding steps seems to have gone through just fine

Please quote the text of the error. Thank you.