Windows 11- PC Health Check Good - msg - This PC can't be upgraded to this version of Windows - for PRECISION 3560 (new 2021)

Dell PRECISION 3560 (new 2021)

For months I have been pestered to upgrade to windows 11 and I am now ready. But I notice there is no longer a prompt in the Windows Update settings.

- So I tried the Windows 11 Installation Assistant at https://www.microsoft.com/en-us/software-download/windows11

Which ran for some time but eventually I got the message:

"This PC can't be upgraded to this version of Windows. Your PC isn't supported yet on this version of Windows. Windows Update will automatically offer you this version of Windows once the issue has been resolved".

With no indication of what the problem was.

Device                     Dell PRECISION 3560 (new 2021)

                    Windows 10 Pro, 64-bit

Processor       11th Gen Intel(R) Core(TM) i7-1185G7 @ 3.00GHz   1.80 GHz

Installed RAM 32.0 GB (31.7 GB usable)

Storage         932 GB SSD NVMe Samsung SSD 980 PRO 1TB

Graphics Card NVIDIA T500 (2 GB), Intel(R) Iris(R) Xe Graphics (128 MB)

System Type  64-bit operating system, x64-based processor

Pen and touch No pen or touch input is available for this display

The only change I have made is to replace the SSD card with 1GB SSD.

SO, has anyone any idea if these kind of problems will be fixed before the October deadline or even what the problems are!