I cant set my own Avatar

I am an Admin on a Server, and I have the same Group as every other Admin, but I can’t set my Avatar. If I select a file, there is no error; it’s just not set. I have the option to change my Avatar, but nothing changes after I chose the File I tried PNG, GIF, and JPG.
We have i_client_max_avatar_filesize on 999999 and also tested with i_client_max_avatar_filesize = -1

Take a look at the server and/or client log, please.

Can other clients upload their avatar on this server?
(which leads to the question if the file transfer port is opened)

Yes everyone can upload his Avatar and its not only on this Server I cant apply an Avatar on any Server

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