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AWDL (Apple Wireless Direct Link) powers macOS features such as AirDrop, Handoff, Sidecar, AirPlay, and Continuity. It shares your Mac’s Wi-Fi radio, which can add latency, jitter, or packet loss to a Tuple call. This applies only to macOS on Wi-Fi. A wired Ethernet call does not use the same radio.

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Why Tuple shows an AWDL warning

Tuple includes an AWDL item in call-quality details when AWDL is active. Because awdl0 is active on many Macs, Tuple shows a warning only when the call is also experiencing network trouble.

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How to reduce interference

The most reliable fix is to use wired Ethernet. If you need to stay on Wi-Fi, you can temporarily disable AWDL from Terminal: 
sudo ifconfig awdl0 down
Disabling AWDL also disables AirDrop, Handoff, Sidecar, AirPlay, and Continuity. macOS might turn AWDL back on after a restart, network change, or use of one of those features.
If call quality remains degraded, see Reducing latency and Fixing connectivity issues.