Login at Minecraft website+ FTB launcher works, but ingame login doesn't work

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BenBensen

New Member
Oct 30, 2022
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Hello together

I gifted a new Minecraft account to my son, in order to play together with me on a server.
We can login on the Minecraft/Microsoft webpage, we can login into the FTB launcher, but we have a strange problem in the Minecraft client.
If I go to "Multiplayer" I see a button "re-login" on the top left corner with a red X symbol.
Ok, I type in his login data again, but we receive a "name or password incorrect" error.
When his account works on the webpage and FTB launcher, why it doesn't here?

I tried to login ingame in different Modpacks and on different PC, but everytime the same error.
I tried to login with my account ... no problems.
Now I have no further ideas and my son is sitting in his room crying.

How can we solve this problem?