Hi Duncan, Ross •,
Welcome to Microsoft Q&A forum.
As I understand, you want to reset Azure SQL Server password.
You may do so using Azure Portal as mentioned by Rahul in the above answer.
Alternatively, you can use Azure CLI/Powershell as shown below:
With Azure CLI:
https://learn.microsoft.com/en-us/cli/azure/sql/server?view=azure-cli-latest#az-sql-server-update
az sql server update --resource-group <ResourceGroupName> --name <Servername> --admin-password <NewAdminAccountPassword>
With Azure Powershell:
Set-AzureRmSqlServer -ResourceGroupName <ResourceGroupName> -ServerName <ServerName> -SqlAdministratorPassword (ConvertTo-SecureString "<NewAdminAccountPassword>" -AsPlainText -Force)
Refer this blogpost for full detailed step by step explanation:
https://techcommunity.microsoft.com/t5/azure-database-support-blog/reset-lost-admin-account-password/ba-p/368920
Hope this helps.
Let us know if you face any issue.
Thanks