Thanks for sharing the workaround you did to let your company's new user receive their email invite, @Smile74.

I've come to share some insights about usage limits in QuickBooks Online (QBO), so you can manage your account users accordingly.

Usage limit per QBO subscription applies to how many billable users, chart of accounts, classes, locations, and tags you can add to your account. When you reach the limit, you can either upgrade your subscription or reduce your usage. 

However, when it comes to users with time-tracking permission-only access, they don't count toward the user limit, like reports-only users. You can learn more about this by checking out this article: Learn about usage limits in QuickBooks Online.

Also, you may want to check out this article as your reference to learn more about the different options for user roles and access permissions in QBO: User roles and access rights in QuickBooks Online.

If there's anything else you need, or you have other concerns about managing users in QBO, I'm always ready to help. Take care, and I wish you continued success, @Smile74.