(ExternalAdministratorPrincipalType) Invalid or missing external administrator principal type. Please select from User, Application or Group.

> ### `az feedback` auto-generates most of the information requested below, as of CLI version 2.0.62

**Describe the bug**
On Azure CLI version 2.27.1, trying to update a SQL server is triggering the following error
ExternalAdministratorPrincipalType) Invalid or missing external administrator principal type. Please select from User, Application or Group.

The same query worked on AZ CLI version 2.16.0 and prior.

**To Reproduce**
Upgrade AZ CLI to the latest version and try to update a SQL server database using the "az sql server update" command.
Example :
az sql server update -g test-dbs-rg -n test-dbs --set tags.app=test

**Expected behavior**
"az sql server update" command should update a SQL server without errors.

**Environment summary**
{
"azure-cli": "2.27.1",
"azure-cli-core": "2.27.1",
"azure-cli-telemetry": "1.0.6",
"extensions": {
"db-up": "0.1.15"
}
}

**Additional context**