Minecraft Dungeons bought and played but I cant install it - FIXED

Hello
I already bought and played Minecraft Dungeons last year. Now i wanted to play it together with some friends after the crossplay update but the launcher tells me i dont own it. Im very frustraded right now. I already loked up if i bought it on a diffrent accounts but i only have 1 mail adress registered. 
I hope you can help me.

Best regards,

sh0o0sh