TinyTex installation doesn't succeed: "This program is blocked by a group policy. For more information, contact your system administrator.""

I am trying to install the TinyTeX distribution (TinyTeX-1) for a client with restricted admin rights in a Windows environment. When trying to install TinyTeX (tinytex::install_tinytex), I always get this message: "This program was blocked by a group policy. For more information, contact your system administrator". The download from https://yihui.org/tinytex/TinyTeX-1 works fine. I have also tried to install TinyTex on a local folder, where I know I have admin rights, and that has not worked. I get the same error message. So my question is:

• Is this error message because tlmgr wants to download from a CTAN mirror that is blocked by the firewall,
• or is it that the installation wants to execute an application that is blocked?

I have tried to add all the necessary paths correctly before the installation.
Sys.setenv((PATH = paste("C:/Users/[user]/AppData/Roaming/TinyTeX/bin", Sys.getenv("PATH"), sep = ";"))
options(tinytex.tlmgr.path = "C:/Users/[user]/AppData/Roaming/TinyTeX/bin/windows/tlmgr.bat")

Unfortunately, I can't give more specifics about the PC, because I currently don't have access to it. I am trying to solve the issue remotely.

I have been trying to resolve this issue for weeks now. I have check all the resolved issues available. Thanks a lot for your help!

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Start with tinytex::install_tinytex and the configured TinyTeX bin and tlmgr.bat paths in the issue. Reproduce the installation on the restricted Windows system and determine whether the group policy blocks CTAN access or an installer executable; done requires a confirmed cause and actionable installation guidance.