This will probably get buried, but Diablo 2's Switch servers have been down for multiple days now without a word from Blizzard. There is currently no way to access Online Characters at
Diablo II: Resurrected Switch gameplay
Diablo II: Resurrected (Nintendo Switch Digital Download)
Diablo III Eternal Collection for Switch gets launch date, pre-orders now open | TechSpot
Diablo 2: Resurrected Is Up For Preorder, New Bundle Available - GameSpot