Changes to the security of the Web Interface start with UC Software 5.3.0 where HTTPS is active as a standard and HTTP has been disabled.
The above is only applicable for SIP Base profiles and LYNC base profile is discussed => here <= already
NOTE: Before activating this feature please ensure you change to factory default password as shown => here <=
In order to enable the HTTP variant of the Web Interface on the phone please go ahead as follows:
Enable the Web Interface for Poly CCX phones in Teams mode:
If the phone is not signed into Microsoft Teams follow this: