@Friend Icare #Friendica is using external media (like youtube) directly and does not "proxify" them. For YT videos there is or was an addon for redirecting it to an #Invidious instance. Since Google started blocking such instances, there are only a few working left. My favorite is https://inv.nadeko.net . So your administrator needs configure it unless not yet done.

For the other external references, I have no idea, just block 3rd-party cookies, I guess.

Wenn eine #Invidious-Instanz ein Problem hat, bietet sie gern einen "Invidious Instanz wechseln"-Link an.

Aus
https://yewtu.be/watch?v=z_Aneyj9kBI

wird dann via
https://yewtu.be/redirect?referer=%2Fwatch%3Fv%3Dz_Aneyj9kBI

etwa
https://inv.nadeko.net/watch?v=z_Aneyj9kBI

oder
https://invidious.privacydev.net/watch?v=z_Aneyj9kBI

oder
https://invidious.fdn.fr/watch?v=z_Aneyj9kBI

oder ...

@metaversum @oldkid @cantences