If they have access already then you can just right click on any record and choose “Copy record URL”.
You could create a field to generate these links automatically with a Formula as well. You’d do that by copying one of these link urls with right click, removing the record’s ID from the end (but not the other parts), and appending RECORD_ID()
to it. Something like this:
"https://airtable.com/xxx/xxx/" & RECORD_ID()
Hope that helps.