Additional calendar-related features and issues within Microsoft Teams for Education
Hello Aurora,
Thank you for reaching out.
I understand that you are having issues with calendar access in the new teams. Based on your description, in case this is only affecting the new teams both desktop and web, you will need to raise a service request to report this symptom to our online tech channel through the O365 admin center if you have the permissions. Otherwise, you can reach out to your admin to raise this for you. A support agent can further connect with you remotely, for further troubleshooting to check on your DNS record changes and also involve the backend team where need be.
Get support for Microsoft 365 for business -- Online support.
Your patience and cooperation are much appreciated.
Best Regards,
Ashraf.