Provides the ability to set an admin to every site in your SharePoint list.

GlobalSPOAdminSet.ps1

Connect-PnPOnline -Url *sharepointadminurl* -Interactive
 
$Sites = Get-PnPTenantSite
 
for($x = 0; $x -lt $Sites.Count; $x++) {
    Set-PnPTenantSite -Url $Sites[$x].Url -Owners "*adminemailaddress*"
    Write-Host "Updating $($Sites[$x].Title), Site $($x)"
}