Hi everyone, sorry to hear that you are running into issues inviting new guests to projects. Generally speaking, there is a 100-guest invite limitation in free spaces to prevent the use of Asana for spam. Old pending invites and multiple invites to the same guest also count towards this limit.
I recommend reaching out to our Support team, regardless of whether this might be the case for you. They can investigate further and check if the invites are being successfully delivered on our end. They might also be able to reset the limit if this is the reason why invites are not being sent.
Please include the email addresses of the guests you’ve been unable to invite in your request, as this will help the Support team look into the cause of the issue. 