How to Unlink a Work or School account in B2C?

I'm looking for an example of how to unlink an Azure Work/School account from a B2C user. I've used this sample policy Account-Linkage-Unified and can successfully link a Work/School account, but the unlinking uses the below Metadata tag to find the entry in the "identities" collection to present the Unlink button... but a work/school account's Issuer is{tenant Id}/v2.0

  <Item Key="ClaimValueOnWhichToEnable"></Item>

I need a way to have this match the value pulled back from the identities collection if it matches "".

Any suggestion is appreciated.

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