Brawl Stars Shop was?

Yes title says almost everything. For me, when I go to the shop and made of skins, the skins are completely there. Otherwise it's not in-game or anywhere else.

What can that be?

I have a Huawei P20lite only for info ^^

Have you already reinstalled?

Yes. Just now, has brought nothing

Then you should contact support. I hear of the problem to the first one. This will be a bug that they are likely to fix quickly.