Azure Pipeline - Strong named assemblies in solution - azure-devops

Question

I have an Azure Pipeline that builds a Winform solution with multiple projects that are Strong signed with a PFX.
I found the following link:
https://dhvik.blogspot.com/2020/01/building-strong-named-assemblies-in.html
This is my YAML file:
# .NET Desktop
# Build and run tests for .NET Desktop or Windows classic desktop solutions.
# Add steps that publish symbols, save build artifacts, and more:
# https://learn.microsoft.com/azure/devops/pipelines/apps/windows/dot-net
trigger:
- master
pool:
vmImage: 'windows-latest'
variables:
- group: 'CertPass'
steps:
- task: DownloadSecureFile#1
displayName: Download Pfx
name: myCertificatePfx
inputs:
secureFile: ventasmlcert.pfx
- task: DownloadSecureFile#1
displayName: Download sni
name: snInstallPfx
inputs:
secureFile: SnInstallPfx.exe
- task: PowerShell#2
env:
SN_INSTALL_PFX: $(snInstallPfx.secureFilePath)
MYCERTIFICATE_PFX: $(myCertificatePfx.secureFilePath)
MYCERTIFICATE_PFX_PASSWORD: $(certpass)
inputs:
targetType: 'inline'
script: '&"$($ENV:SN_INSTALL_PFX)" "$($ENV:MYCERTIFICATE_PFX)" "$($ENV:MYCERTIFICATE_PFX_PASSWORD)"'
- task: NuGetToolInstaller#1
- task: NuGetCommand#2
inputs:
restoreSolution: '$(solution)'
- task: VSBuild#1
displayName: 'Build .csproj file'
inputs:
solution: '$(solution)'
platform: '$(buildPlatform)'
configuration: '$(buildConfiguration)'
- task: VSTest#2
inputs:
platform: '$(buildPlatform)'
configuration: '$(buildConfiguration)'
Everything works fine in the pipeline for the signing of my PFX:
But when building the solution I still get the error, but was looking that the Container where the signing was added is different from the other Containers of each project that needs to be signed.
This is the error:
Error MSB3325: Cannot import the following key file: ***cert.pfx. The key file may be password protected. To correct this, try to import the certificate again or manually install the certificate to the Strong Name CSP with the following key container name: VS_KEY_71452E506F1E61FB
Any clue?