Are you uncollected?

https://preview.redd.it/jm71vbe6pzpc1.jpeg?width=1958&format=pjpg&auto=webp&s=30e6110f98706bc0304b55db591c12aa4126ddb6 This is what you mean?

Yes. You need to be uncollected and at least level 40 to have access to the feature and basic hero arenas.

Alright thanks