internal/functions/resolve/Resolve-Application.ps1

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function Resolve-Application
{
    [CmdletBinding()]
    Param (
        [Parameter(Mandatory = $true)]
        [string] $InputReference,
        [switch] $DontFailIfNotExisting,
        [System.Management.Automation.PSCmdlet]
        $Cmdlet = $PSCmdlet
    )
    
    begin {
        $InputReference = Resolve-String -Text $InputReference
    }
    process
    {
        try {
            if ($InputReference -match $script:guidRegex) {
                $providedId = $true
                $application = Invoke-MgGraphRequest -Method GET -Uri ("$script:graphBaseUrl/servicePrincipals/{0}" -f $InputReference)
            }
            elseif ($InputReference -in @("All", "Office365")) {
                return $InputReference
            }
            else {
                $application = (Invoke-MgGraphRequest -Method GET -Uri ("$script:graphBaseUrl/servicePrincipals/?`$filter=(displayName eq '{0}') and (servicePrincipalType eq 'Application')" -f $InputReference)).Value
            }

            if (-Not $application -and -Not $DontFailIfNotExisting) { throw "Cannot find application $InputReference" } 
            elseif (-Not $application -and $DontFailIfNotExisting) { return }

            if ($application.count -gt 1 -and -not $providedId) { throw "Got multiple applications for $InputReference" }
            return $application.appId
        }
        catch {
            Write-PSFMessage -Level Warning -String 'TMF.CannotResolveResource' -StringValues "Application" -Tag 'failed' -ErrorRecord $_
            $Cmdlet.ThrowTerminatingError($_)                
        }            
    }
}