Background: I started out with 9/10 active users. I tried inviting the 10th user and got an error message (see screenshot). I de-activated 1 user making it 8/10 active users and tried again. The same error message appeared. The billing page shows that I only have 8 users.
To confirm, I have 8 users with status "Has site access" and 1 user with status "No site access". I also tried re-activating the 1 person to give them site access and the same error message below appeared for them too.


