[RhysJR]

How does that work?  

34 (ARD/ZDF) + 17 (RTL) = 51

And as far as I know the tournament only got 51 matches. So where does Magenta take five exclusive matches from?

I think RTL are broadcasting five less matches than they were going to originally, if I've read the quote below correctly. So all 51 on Magenta, five exclusively, with 34 on ARD/ZDF and 12 on RTL.

Media rights: Reallocation of exclusive matches, joint studio with RTL.
Telekom also announced news today regarding media rights. The company has acquired the media rights to all 51 UEFA EURO 2024TM matches that will be shown live on MagentaTV. In addition, the sublicensing arrangement had previously provided for ARD and ZDF to show 34 of these matches live, while Telekom had sub-licensed the 17 other matches to RTL. Telekom announced today that this initial situation has changed due to a far-reaching cooperation with RTL.
"A tournament in our own country is the perfect opportunity for us to present MagentaTV's sports expertise to football fans.  We are therefore even more pleased that we were able to agree with RTL on a redistribution of the exclusive matches. Five matches, or more precisely, four group stage matches and one round of sixteen match, will be shown in Germany exclusively on MagentaTV. As such we are creating recognizable added value for our customers and further enhancing MagentaTV, as we did for the two previous tournaments," said Managing Director Private Customers at Telekom.

www.telekom.com 

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Of course if Wales get there, their matches will be shown in Welsh on S4C as well.

Let's not tempt fate. There's still a bit of football before that is a certainty.