A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Dear Jennifer Marshall,
Based on the behavior described, the most likely cause is that the Volunteer site is a Communication site, or another SharePoint site that is not connected to a Microsoft 365 Group. The Group Calendar web part is designed for use on a Microsoft 365 Group-connected Team site. When it is added to an unsupported site type, SharePoint may reserve space for the web part without displaying the calendar or providing access to the web part properties.
This would also explain why moving the web part from the teal vertical section to a regular page section did not change the behavior. The page layout is unlikely to be the cause.
To confirm the site configuration, please complete the following checks:
- Open the affected SharePoint site.
- Select Settings > Site information.
- Confirm whether the site is identified as a Team site and whether it is connected to a Microsoft 365 Group.
- In Outlook on the web, open Calendar > Groups and verify that the intended Group calendar is available and accessible.
If the site is not connected to a Microsoft 365 Group, the supported options are:
- Create or use a Microsoft 365 Group-connected Team site and add the Group Calendar web part there.
- Keep the current Volunteer site and add a Quick Links, Button, or Call to action web part that directs users to the Group calendar in Outlook on the web.
- Maintain the Volunteer site as the public-facing site and use a separate Team site for committee collaboration and recurring calendar management.
If the site is already a Group-connected Team site, the blank web part would be unexpected. In that case, please test the Group Calendar web part on a new blank page, using a regular one-column section and an InPrivate browser window. I should also confirm whether the issue affects multiple users or other Group-connected Team sites.
I hope the information shared helps point you in the right direction.