It sounds like you are hitting a classic Power Apps quirk with Dataverse Choice (multi-select) columns. When you see the commas but no text, it usually means you're pointing at the record object rather than the specific text field that holds the "friendly" name.
In Dataverse, multi-select choice columns are essentially a table of objects. To get the readable text, you need to reference the .Value or sometimes the .Name property depending on your specific connector version, but usually, it's about how you handle the Concat scope.
The Solution
Try updating your formula to explicitly reference the value within the Concat function:
Concat(ThisItem.job_tags, Value, ", ")
Why your current formula isn't showing text
Here is a quick breakdown of why ThisItem.job_tags.Value often fails in this context:
The "Table" vs. "Column" issue: ThisItem.job_tags is already a table. When you add .Value outside the Concat (like ThisItem.job_tags.Value), you are trying to treat a whole list as a single value.
Scope: Inside the Concat() function, the second argument is where you tell Power Apps which field from that table to flatten into text.
