Upgrading from 2019 to 2022 - Unresolved reference: toExtId

Upgrading version from TeamCity 2019.2 to 2022.04.

TeamCity server configuration: On Premise

Followed documentation: https://www.jetbrains.com/help/teamcity/upgrading-dsl.html#Update+DSL+from+2021.2.x+to+2022.04.x

We've also upgraded our TC DSL to be taken from our new server and all dependencies seems to be installed properly.

We have a code which worked perfectly in our previous version (2019.2) which is now unresolved reference.

import jetbrains.buildServer.configs.kotlin.v10.toExtId
something.toExtId() <-- unresolved reference

 This seems to be NOT-supported in the current version.

Where could we find this? Was it replaced? if so, by what?