We need the messaging / tooltip to be a little more clear for the custom Run Key field, to avoid users entering undesirable values. Julia's suggestion was this but let's wordsmith / condense it a bit:
The ‘Run Key’ refers to the term in each course ID (ex: if your course ID is course-v1:ASUx+TAM582x+1T2020, then ‘1T2020’ is the Run Key.)
If you have a specific Run Key that you would like to enter, you would enter the Run Key only (ex: 1T2020) in this field, and this Run Key will be appended to the rest of the course ID and create the full course ID of course-v1:ASUx+TAM582x+1T2020.
If this field is left blank, the Run Key value will be based on the start date of the course.
Letters and Numbers only, please.