Who else has problems to join, request alliances?
There are major issues of sending or receiving invitations to existing alliances. The only way to create Alliances you need to declare a Clan as a new Alliance group and send an invitation to every Clan you like to join, but only if that clan has no other alliances yet.
1) Therefor you still need either to be the founder of those groups / clans,
2) or you need to be a member of that group.
3) Furthermore if you are a member of that group (you didn't create yourself) it's seemingly only working for groups, not for clans.
Did several attempts in Safari/Firefox on a Mac OSX system running.
Would be nice, if you could solve this issue asap. Thanks in advance.
Because I'm not alone with that bug, see also: http://www.bungie.net/en/Forum/Post/67168972/0/0/1