After a small break back in to blogging again. I also created a quick video of the steps below:
First of all check your firmware > latest version: 3.1.1-216109 (writing on 2020-06-09). Go to General Settings > Provider The System will now be rebooted, the admin password will be changed back to default (last 6 digits of the serial number).
After login you will need to set the provider again to Microsoft Teams because the Poly x30 (or x50) is restarted to factory default.