SubscriptionChooser.ps1

$azExists = Get-InstalledModule Az -AllVersions -ErrorAction SilentlyContinue

if ($azExists) {
    Write-Host "Az PowerShell installed ..."
}
else {
    Write-Host "You need Az PowerShell https://docs.microsoft.com/en-us/powershell/azure/"
    Break
}

Import-Module Az

# https://github.com/Azure/azure-powershell/issues/8628#issuecomment-478644165
$azureContext = Disable-AzContextAutosave -Scope Process
Clear-AzContext
# Clear-AzContext -Scope CurrentUser -Force # https://github.com/Azure/azure-powershell/issues/8628

$azureAccount = Connect-AzAccount

$azureSubscriptions = Get-AzSubscription

$azureSubscriptionCounter = 1
foreach ($azureSubscription in $azureSubscriptions) {
    Write-Output "($azureSubscriptionCounter) $($azureSubscription.Name)"
    $azureSubscriptionCounter++;
}

$subscriptionNumber = Read-Host 'Please choose subscription'

$subscription = Select-AzSubscription -SubscriptionId $azureSubscriptions[$subscriptionNumber - 1].Id