@kannagatla swamy ，A single Intune user can enroll up to 15 devices by using a single Intune license. We can see more details in the following link:
Also, we can configure enrollment restrictions to set maximum number of devices that a user can enroll. Here is a link for the reference:
For the devices we can manage in Intune, based on my research, I didn't find any official article mention this. So I think there's no limit now.
Hope it can help.
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