Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
I fixed my client's looping issue by doing a similar step for the web version of outlook.
Switched the browser setting to "Custom"
and then added 'https://outlook.office.com ' to the exceptions list,
closed the browser, pulled it back up again.
Now instead of looping to the inbox, it pulls up the scheduling page.