What is the correct limit on "unanswered invitations" in PC in EasyChair?

We would like to add more PC invitations in EasyChair, but we had reached the limit of 100 in the free license. We then purchased the Professional license because the EasyChair help page indicated that the Pro license had a limit of 300. enter the description of the image here

Now, when we try to add more invitations, EasyChair still allows no more than 100 unanswered invitations. I can not understand why. He says we also have a professional license.