how do i login when i linked my Minecraft account with Microsoft

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Just as normal - if you're using the FTB app that uses the default mojang launcher, and you should sign-in to that with your account.

If you have issues with your account, you need to contact Mojang / Microsoft to get support with that.
 
I am sorry to resurrect this thread, but I cannot get it to work.

When I start Minecraft with the normal Minecraft launcher, I choose Microsoft login and see my XBox gamer tag and am greeted with my XBox name. A click on the Java Edition starts the game.

When I try this with the FTB launcher instead, it goes like this:

— click on FTB, the apps opens, and I choose for example on Regrowth
— the normal MC launcher opens, and it shows up on the left side 'Player Mojang-Konto'

But here is only the Demo Mode visible. There is no way to log in now.

I CAN still login with a browser to Mojang, but there is no longer any mention that I ever possessed Minecraft at all. And I am not sure, where to see that at all.
 
The FTB launcher ( = the old legacy / classic one), does not support - and never will - Microsoft accounts.

You need to use the new FTB app, it sounds like you are based on the description, but I just want to make sure so there's no misunderstandings.

If that is what you're using - please re-install the FTB app to clear out old cached settings (if that might be the case of the issue), make sure you take backups of worlds and such.