Traditionally loopMeeting (LM) is using the EWS API with basic authentication for integration with Exchange 2010, 2013, 2016 and 2019. Using https (TLS1.2) protocol.
However, for Microsoft 365 it is announced that they will not continue developing features for EWS API and retire support for basic authentication. Their focus going forward on MS365 is their new MSgraph API and OAuth2 authentication.
Microsoft will retire basic authentication for EWS in Office 365 sometime in second half of 2021. However, if you set up a new 365 tenant basic authentication will be disabled by default and enforce you to use OAuth2.
With ths guide you will enable your environment to use both MSgraph and EWS with Oauth2 authentication