Hi @Kim Marion Maquiling
Thank you for posting this in Microsoft Q&A.
I understand your question as to why Global Administrators are not allowed to use SSPR (Self-Service Password Reset) in Microsoft Entra Id.
By default, Global Administrators are allowed to use SSPR (Self-Service Password Reset) in Microsoft Entra Id. To minimize the risk of privilege escalation attacks, it is advisable not to utilize Global Administrators for routine activities such as password resets. Instead, it is recommended to employ a dedicated account with appropriate permissions for carrying out administrative tasks, including password resets.
For your reference: https://learn.microsoft.com/en-us/entra/identity/authentication/concept-sspr-policy#administrator-reset-policy-differences
Hope this helps. Do let us know if you any further queries.
Thanks,
Navya.
If the answer is helpful, please click "Accept Answer" and kindly "upvote" it.