Find ID within an excel cell containing multiples values separated by comma

Question

I'm trying to find an ID within an excel cell but this cell contains might contain one or multiples values (separated by comma), I've used the following formula but the problem is that only validates against the first value in the cell ignoring the rest (even ignoring the first one if the cell contains multiple values, due to comma next to it) which return incorrect results where the actual value to look for is an another position rather than the first one.

Current formula --> =NOT(ISERROR(MATCH(B2,A:A,0)))

Hope you can help. Thanks.

Example tables

Answer 1

Here is another method that seems to work based on your description. ExcelJet: Cell contains specific text

Example Table with Formula