Hi @Mike Hudgell ,
Thanks for the question. Are you trying to access app service managed certificate through the portal?
In the meantime, can you please try using this ARM template?
You can use this Powershell script to run ARM template
$subscription = "SUBSCRIPTION-ID"
$resourceGroupName = "RESOURCE-GROUP-NAME"
$appServicePlanName = "APP-SERVICE-PLAN-NAME"
$subjectName = "DOMAIN-NAME"
Set-AzureRmContext -SubscriptionId $subscription
$appServicePlan = Get-AzureRmResource `
| Where-Object {$_.ResourceGroupName -eq $resourceGroupName } `
| Where-Object {$_.Name -eq $appServicePlanName}
New-AzureRMResourceGroupDeployment `
-ResourceGroupName $resourceGroupName `
-SubjectName $subjectName `
-AppServicePlanName $appServicePlanName `
-Location $appServicePlan.Location `
-TemplateFile "CreateHttpFreeCert.json"
This script will only create an App Service Managed Certificate for a custom domain that has already been added to your web app. If you run this script before adding a custom domain to the web app, the script will fail.
Best,
Grace