Observation Details
Headings must be used to describe topic or purpose of the content they introduce. The heading "Live und jederzeit auf Abruf" does not describe the following content's topic. As is, the heading must describe the topics:
What programs are included in DAZN service (what matches / events are shown)
Buying DAZN with MagentaTV ("Buchen Sie DAZN bequem zu Ihrem MagentaTV Vertrag dazu")
Both contents are not accurately described by "Live und jederzeit auf Abruf". Especially the content of buying the DAZN option with CTA should be easily findable and the given heading does not leads the user to believe the CTA to be found there.
Heading structure / outline is the most used navigation method for screen reader users. A functioning heading structure is most important (and easiest) way to ensure understandable and navigable content structure.
Remediation Notes
Ensure an accurate heading structure so that every heading accurately and precisely describes the contents it introduces.