Hi @Trezona ,
Access to the Advanced Management Portal has been removed for Pay-As-You-Go subscriptions. Therefore, you will have to transfer you domain out of Azure in order to change NS servers. Managing an App Service Domain has a step-by-step procedure for performing this action through the Management REST API. Essentially, you will use one of the following commands to get an authorization code that you will then use at your preferred registrar.
- Using Azure CLI:
az rest --method PUT --uri 'https://management.azure.com/subscriptions/{subId}/resourceGroups/{rgName}/providers/Microsoft.DomainRegistration/domains/{domainName}/transferOut?api-version=2021-02-01'
- Using PowerShell:
Invoke-AzRestMethod -Path "/subscriptions/{subId}/resourcegroups/{rename}/providers/Microsoft.DomainRegistration/domains/{domainName}/transferout?api-version=2021-02-01" -Method PUT
Do note if you recently purchased your domain, transferred it, or updated the contact information, you will not be able to transfer for 60 days. If run into any issues or need additional assistance, please follow directions provided by @SnehaAgrawal-MSFT .