Hi,
I've recently added 2 missing channels on my web.magentatv.E.de.channels.xml. As Magenta TV is not listed at GitHub, I ask you to add them manually:
< channel update="i" site="web.magentatv.E.de" site_id="4375##8d357b66f690d33782534c06a9d8fd5bd1ac216b.png" xmltv_id="#DABEI">#DABEI
< channel update="i" site="web.magentatv.E.de" site_id="4358##e14f9ee2088d8203ccbfa4a186e9e5c385739525.png" xmltv_id="Disney+">Disney+
Remove the ' '. Furthermore, there's an entry for site id 620+4357. There's no matching channel available and the channel name makes no sense.