As per https://learn.microsoft.com/en-us/entra/identity/users/directory-service-limits-restrictions
"By default, a maximum of 50,000 Microsoft Entra resources can be created in a single tenant by users of the Microsoft Entra ID Free edition. If you have at least one verified domain, the default Microsoft Entra service quota for your organization is extended to 300,000 Microsoft Entra resources."
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hth
Marcin