The ownership of the project might still be on the free account. You need to be signed in with the email address that has the payed account to be able to change the ownership.
This is done in the Settings > Project details
Than it will pick up the license and other admins and users (depending on the settings) should be able to invite more team members.

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Jack de Moel
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Original Message:
Sent: 11-03-2023 03:55
From: Jose Antonio Haro
Subject: Adding Users
I have the same the same problem.
I have a business licence but I can't add more users. I'm the admid in the project.
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Jose Antonio Haro
Original Message:
Sent: 09-09-2019 13:33
From: German Aparicio
Subject: Adding Users
I have a business license and unable to add users to project. Can I get some assistance with this?
Thanks,
German