I've seen a lot of very long and complicated methods so I decided to make it much easier for everyone... this has worked for me for the past 48 hours, no problem.
On startup, go to DD and play anything once. I usually do daily moments bc most of the time it's just one plate appearance.
Quit DD. Go to RTTS.
Go back to the clubhouse after every game. I only change active loadouts by going through the touch pad. (Ps5)
I've been playing since 9am and my progress hasn't stopped once. The only issue I came across was the server dropped yesterday and when I reconnected I had to repeat steps 1 and 2. After that if was fixed again.
Oh I forgot to mention that you don't have to beat the DD moment, just play it.