update pr per comments

internal/services/dataprotection/data_protection_backup_instance_mysql_flexible_server_resource.go

@@ -193,13 +193,13 @@ func (r DataProtectionBackupInstanceMySQLFlexibleServerResource) Read() sdk.Reso
 				if props := model.Properties; props != nil {
 					state.Location = location.NormalizeNilable(props.DataSourceInfo.ResourceLocation)
 
-					serverId, err := servers.ParseFlexibleServerID(props.DataSourceInfo.ResourceID)
+					serverId, err := servers.ParseFlexibleServerIDInsensitively(props.DataSourceInfo.ResourceID)
 					if err != nil {
 						return err
 					}
 					state.ServerId = serverId.ID()
 
-					backupPolicyId, err := backuppolicies.ParseBackupPolicyID(props.PolicyInfo.PolicyId)
+					backupPolicyId, err := backuppolicies.ParseBackupPolicyIDInsensitively(props.PolicyInfo.PolicyId)
 					if err != nil {
 						return err
 					}
@@ -236,6 +236,9 @@ func (r DataProtectionBackupInstanceMySQLFlexibleServerResource) Update() sdk.Re
 
 				return fmt.Errorf("reading %s: %+v", *id, err)
 			}
+			if existing.Model == nil {
+				return fmt.Errorf("retrieving %s: `model` was nil", id)
+			}
 
 			parameters := *existing.Model
 

website/docs/r/data_protection_backup_instance_mysql_flexible_server.html.markdown

@@ -86,11 +86,11 @@ The following arguments are supported:
 
 * `location` - (Required) The location of the source database. Changing this forces a new resource to be created.
 
-* `vault_id` - (Required) The ID of the Backup Vault within which the MySQL Flexible Server Backup Instance should exist. Changing this forces a new resource to be created.
+* `backup_policy_id` - (Required) The ID of the Backup Policy.
 
 * `server_id` - (Required) The ID of the source server. Changing this forces a new resource to be created.
 
-* `backup_policy_id` - (Required) The ID of the Backup Policy.
+* `vault_id` - (Required) The ID of the Backup Vault within which the MySQL Flexible Server Backup Instance should exist. Changing this forces a new resource to be created.
 
 ## Attributes Reference