Please check if the microphone is allowed
2. Please check (under settings >> phone numbers) if the call timeout is greater than 0 and less than 600
3. Please check if there's any Google extensions (VPN) that might block the call dialing.
4. Please try using an incognito window in your browser or do a hard refresh on your browser.
here is some instruction to do a hard refresh browser and clear cache https://fabricdigital.co.nz/blog/how-to-hard-refresh-your-browser-and-clear-cache
If none of the above work, please reach out to Support@saasflow.net