I have no clue if this is occurring for other systems, but the Nightwave "catch up" mechanic does not seem to be working on the Switch. I haven't been able to play for a few weeks because I was moving, so when I remembered the catch up mechanic existed, I was excited. Now, after I've done all of this week's challenges, I've learned that I am unable to catch up. The missed missions do not appear as available, they only appear for a short time and then promptly disappear when I attempt to do any of them. Hopefully this gets fixed soon, unless there is a way to do it myself.