In Messenger Clients Calls the audio quality is very poor

Hi, I’m using the Jolla Phone 2026 with OS 5.2. I really like the device, but I’m having trouble making calls via messenger clients (Signal, WhatsApp, and Delta Chat). For example, while I can initiate calls on Signal, I can’t receive any, and when a call does go through, the audio quality is very poor for the person on the other end. WhatsApp calls don’t work at all, and Delta Chat behaves similarly to Signal. Is there anything I can do to fix this?