Page Telling Me Im Not Authorized

Im trying to join a new game but when I click the link it tells me im not authorized. This hasent happened before when I tried to join other games. It says " Either you are not logged in or do not have access to this page".  Im logged in so thats not the issue, I dont know what it means to not have access the this page. The GM of the game says he didint do anything to make me not be able to join so I dunno what to do. Please help.

If you are not the creator nor invited into the game then you will get the not authorized notification. The GM needs to either send you an invite or you post to his LFG listing page so he can click on the blue invite button so you can get an invite notification/offer. If the GM indicates you have an active invite but you have not received it, the GM will have to cancel the invite and resend it to you (recommended sending the invite link through PMs).