Bought Minecraft Dungeons but can't play it. What to do?

Bought it for the launcher (Standard Edition) but can't play it (see picture)

Do you have the "Minecraft Launcher" installed? And are you logged in with the same account as when you bought it?

Jup am inside with my Microsoft account and there it works, even though I bought it with the Mojang account. WTF

Mojang belongs to Microsoft and as far as I have heard, the Mojang content is to be implemented / bound in Microsoft accounts in the future. This has apparently already happened to you.

I haven't used my Mojang account for a long time, so I don't know what the status is today.

OK thanks