Why does Abaqus not find my c++ compiler?

Question

I need to use uMat and user subroutines in Abaqus. I installed Abaqus 2020, Visual Studio 2019, Intel oneApi Base Toolkit and Intel oneApi HPC Toolkit (in this order). After successfully linking the Fortran Compiler (Intel Fortran Compiler 2021.4) with VS19 (setting all the path variables and editing the abaqus2020.bat and the abaqus_v6.env) I started Abaqus Command (as admin) and used the command abaqus verify -user .. it PASSED right away.

My main problem is: if I plug in "abaqus info=system" everything is fine except the C++ Compiler.

C++ Compiler: Unable to locate or determine the version of a C++ compiler on this
system. If a C++ compiler is installed on this system, please load vcvars64.bat
file before running Abaqus

I tried:

• different versions of VS
• different OS
• different Processor
• calling the vcvars64.bat in abaqus2020.bat
• Installing third party c++ compilers (MinGW)

My current setup:

• Processor: AMD Ryzen 5 3600
• RAM: 32 GB DDR4 3200
• Graphics: MSI NVidea Geforce GTX 1660 Ti
• OS: Windows 11
• Linker Version: Microsoft Incremental Linker Version 14.29.30137.0
• Fortran Compiler: Intel Fortran Compiler 2021.4 MPI MS-MPI 9.0.12497.11

Error Message