@DavidJTavares-6375,Thanks for posting in Q&A.
From your description, I know you have problem with enrolling hybrid joined devices in Intune from multiple locations.
Based on my research, there may be the locations restrictions in Conditional Access policy which will allow the trusted locations to enroll in Intune and block rest of others to enroll in Intune.
There are some methods you can try to resolve this issue.
1.Please go to Intune portal to check if there exist Conditional access policy to block Intune enrollment and delete the policy.
2.You can use VPN to configure the specific IP address to successfully enroll in Intune.
Please try above information, if there is any update, feel free to let me know.
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