I'm trying to find the ID for each value in a cell. I tried using a VLOOKUP but it fails when a cell has more than one value.
In this scenario, B2 would be updated to 4,1
TEXTJOIN with an IF:
=TEXTJOIN(",",TRUE,IF(ISNUMBER(SEARCH(","&SUBSTITUTE('Item Details'!$A$2:$A$6," ","")&",",","&SUBSTITUTE(A2," ","")&",")),'Item Details'!$B$2:$B$6,""))
This will order the output on the lookup table order
Another option is using XLOOKUP:
=TEXTJOIN(",",TRUE,XLOOKUP(FILTERXML("<a><b>"&SUBSTITUTE(A2,",","</b><b>")&"</b></a>","//b"),'Item Details'!A:A,'Item Details'!B:B,"",0))
with Office 365 which will order by the input.