Symbols AA, BX, IGT, NOV have n/a values on daily Pre-Market summary e-mail

Avatar

Symbols AA, BX, IGT, NOV have n/a values on the daily Pre-Market summary e-mail.  This began on May 4, 2020, and continues with each daily report.  I have deleted these symbols from my portfolio and then added them back a day later - they still have n/a values.