Сhanging few bridge settings didn’t help.
I went to E2700 and switched from 5GHz to 2.4GHz (I only had 5GHz enabled) and AirPlay started working.
Then I turned on Wi-Fi on the provider’s router and turned off the E2700. AirPlay also worked at 2.4GHz, but at 5GHz, the bridge did not connect to the router at all.
Now it remains to compare sound difference at 2.4GHz and 5GHz on Bartok, ahaha)))
Or enable both bands and use 2.4GHz for bridge only.
If the bridge is dual-band, how can explain the incorrect AirPlay playback at 5GHz?