Hello Aleksandar,
Thank you for getting in touch with Atlassian Community!
This error appears when there are no more licenses available for the products.
On Site administration > Billing > Manage subscriptions, you can see how many licenses are being used for each product.
Then, you must remove users from products that they are not using in order to let some seats available for others or you can also remove all the Product access for new users, so you can invite them, but they will not have access until you add them to the groups that give a license.
Regards,
Angélica
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