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For troubleshooting questions, please post in the following format:
I upgraded Mattermost Team Edition to the version 7.4 recently. I could see the the call feature available but it is not working. I could start the call but after 10 seconds it stops mentioning an error as in screenshot.
Steps to reproduce
Click on the call option in Mattermost version 7.4 Team edition
Will receive the error as in the screenshot - Screenshot by Lightshot
Tried changing the port from 8443 to 8445 to test and also rebooted the server after the upgrade to test any conflict of ports but none worked.