STM32L452 USB virtual com port connect

[Yoon1983]

Hello
I have a question. Using the STM32L series, the current USB virtual com port is recognized in the device manager of the PC.
Here, I am curious about the maximum number of Com ports that can be connected to the PC.
I know that the basic Com port is connected up to 255.
However, the maximum of 60 is not connected to the PC or laptop, and the device is not recognized with an exclamation mark in the device manager.
I want to know why the number does not increase and the exclamation mark appears.
I want to know which specifications of the PC or laptop can tell me how many Com ports can be connected at the maximum.
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I am using the CPU below.
CPU: STM32L452RET

Below are the laptop specifications. Processor: AMD Ryzen 7 5700U with Radeon Graphics 1.80 GHz
Installed RAM: 16.0 GB (15.4 GB usable)
System Type: 64-bit operating system, x64-based processor
Edition: Windows 11 Pro
Version 24H2
Installation Date ‎2024-‎12-‎05
OS Build 26100.3476
Experience Windows Feature Experience Pack 1000.26100.54.0

[TDK]

> However, the maximum of 60 is not connected to the PC or laptop, and the device is not recognized with an exclamation mark in the device manager.

So you're not connecting something, and then nothing happens, and you want to know why? I suspect typos in your question. Unclear what's happening.

Max devices is 127, including hubs, and there is a maximum hub chain length.