Finding all of the values in a lookup field in SharePoint Online with PowerShell

Question

So I've been having a hell of a time with this. I'm using the SharePoint PnP module to try automate some SharePoint tasks.

Essentially I am trying to add a new item to a list that has lookup fields. The sticking point I have now is trying to add a lookup field value that does not yet exist in the list but it exists in the lookup field.

I can't seem to find a way to capture what exists in the lookup field itself, just what currently exists in the lookup field in the list.

$List_SkillsPerAgent = Get-PnPList -Identity SkillsPerAgent

$DCISkill = (Get-PnPListItem -List $List_SkillsPerAgent -Fields "wsp_ucc_spa_skill").FieldValues.wsp_ucc_spa_skill | Where-Object { $PSItem.LookupValue -eq 'DCISkill' } | Select-Object LookupId -First 1

$PhoneQueue = (Get-PnPListItem -List $List_SkillsPerAgent -Fields "wsp_ucc_spa_skill").FieldValues.wsp_ucc_spa_skill | Where-Object { $PSItem.LookupValue -eq $Queue.Replace('_', ' ') } | Select-Object LookupId -First 1

$Agent = (Get-PnPListItem -List $List_SkillsPerAgent -Fields "wsp_ucc_spa_Agent").FieldValues.wsp_ucc_spa_Agent | Where-Object { $PSItem.LookupValue -eq 'sip:somefakeemail@domain.com' } | Select-Object LookupId -First 1 

The first two steps work fine because those values already exist in the list, however the last one 'sip:somefakeemail@domain.com' does not exist in the list yet so I can't find its LookupID with Get-PnpListItem, however it does already exist in the lookup field wsp_ucc_spa_Agent.

I tried messing around with Get-PnpField but no such luck yet.

Is there anyway to capture all of the values in that lookup field?

Answer 1

The values in the lookup field are stored in the parent list you refer to. To capture all of the values in lookup field. I would suggest you find them in the parent list, the lookupID should be the listItem id in parent list.