Once you see the blue Sigh in button instead of the LMS365 web part:
· Check what Browser do you work in. If it is Google Chrome, be sure that the Block third-party cookies setting is turned off for your Browser. Navigate to the Google Chrome settings > Advanced > Privacy and security > Site Settings > Cookies and site data > Block third-party cookies:
· If this is not permissible by your organization's settings, please add login.microsoftonline.com to the “Allow” section. Navigate to the Google Chrome settings > Advanced > Privacy and security > Site Settings > Cookies and site data > Allow:
If you are an Administrator, click the button and accept the permissions required. From now on the web parts will be loading for users with no additional actions required.
If you want to make LMS365 SPFX web parts load for users automatically on the first visit, the Tenant Administrator will need to perform the following steps: go to Azure Active Directory admin center > Enterprise applications > LMS365 API Client > Permissions > click the "Grant admin consent" button: