Hello Carmen, welcome to the Q&A.
I don't have access to your specific Intune settings and policies. However, if your company has implemented a policy requiring a minimum of 8-digit PIN for security reasons, it's unlikely that you will be able to change it back to 4 or even 6 digits.
Changing the PIN length requirement could violate your company's security policies and may not be allowed by your IT department. It's important to follow your company's security guidelines to help protect sensitive data and systems.
If you have any concerns or questions regarding the PIN length requirement, you can contact your company's IT support team for further assistance. They should be able to provide you with more information and help you address any issues related to Intune policies.