Pokemon Scarlet; can't access installed DLC

[xusrQXr2]

Recently installed ver 3.0.0 and the New Uniform DLC, and already completed the main story before installing the DLC, but upon booting up the DLC prompt (phonecall) won't appear. I've opened and closed the game multiple times, but nothing happens. I've claimed the new uniforms and I can use all of the new clothing no problem. I've also tried reinstalling all the files, including the base game, but nothing happens (although save file stays intact). Unsure of the issue; please help?

Photos of my Switch (ver 16.1.0).

 

[Hayato213]

You finished Teal Mask?

 

[xusrQXr2]

Forgot to clarify; I can't even start Teal Mask. A while back I installed 2.0.0, couldn't access Teal Mask but could get the uniforms, and forgot about it until Indigo Disk released. I recently updated to 3.0.0 and the Teal Mask prompt still won't appear.

After looking around some more, I think the problem might be the Switch version, but if anyone has any answers then I'd still appreciate them.