Client is not compatible and server is not sending a compatible format

[Stroller]

"I mean the default player in the Jellyfin app (on playstore) which is html player. "

this is where the confusion is; the "official" jellyfin app from the playstore DOES NOT use html and is not an html player
if you downloaded something from the playstore that is an html player then it's not the official one and that should be noted when posting; everyone is going to assume the official one is in use

It's the official jellyfin app on playstore, but I can use différent player using jellyfin options so I'm giving the option I used :