Error displayed in Office365 Integration Configuration page when there is no valid license

[ilieandriuta]

STEPS TO REPRODUCE

Environment: Windows 10 Pro 64bit, Edge 90, using an instance of XWiki 13.3 on MariaDB 10.5, Office365 Integration (Pro) 1.7

1. Install Office365 Integration (Pro) (I tested with 1.7)
2. Go to Administer Wiki > Other > Office365

EXPECTED RESULTS

A warning macro with a message is displayed, informing that there is no valid license for the application, like the message displayed on app's page from Applications Panel:

There is no valid license for Office365 Application (Pro). Please visit the Licenses section.

ACTUAL RESULTS

An error is displayed instead:

No class found by the name {0}, can''t display configuration.

Environment: Windows 10 Pro 64 bit, Firefox 88, using a local instance of XWiki 12.10.7 on HSQL 2.5.1, Jetty 9.4.29