Sheet not being shared

My Browser Information: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0

Relevant Links: https://www.myth-weavers.com/sheet.html#id=1798332
Referrer: https://www.myth-weavers.com/forumdisplay.php?f=8

Message: Non-owners attempting to access the link (which is NOT private) are getting a message saying the sheet does not exist

EDIT: It seems isolated to a single user, Darkgodariaz