AIFF is not supported by Android TV. But the server SHOULD be remuxing or transcoding it. Did you disable transcoding? Is the server trying and failing to transcode?
Jellyfin 10.10.7 (Docker)
Ubuntu 24.04.2 LTS w/HWE
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
4x WD Red Pro 6TB CMR in RAIDZ1