I offered a tip earlier that wasn't helping anyone and now I know why. I bought a new Mac laptop with OS 13.4, the same is happening to me (in clamshell mode and after the 2 external monitors go to "sleep" overnight) where my second display is not being recognized by Displaylink software when I try to "wake up" the screens.
I'll run the display link support tool the next time it happens and report this.
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