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Dear CK1104,
Thank you so much for sharing more about your role. I really respect the effort you put into building SharePoint sites and helping users become more comfortable with the platform. I definitely see the challenge, especially when you don't have access to the Microsoft 365 admin center.
As a possible workaround, some community members use third party websites that aggregate Microsoft 365 Message Center and Roadmap updates. You may find these helpful:
Note: These pages are shared by the community for your convenience and are provided by third parties. They aren't managed, developed, or verified by Microsoft. I can't guarantee the quality, safety, or suitability of the apps, or any content or software they may include. Please review them carefully and ensure you understand any potential risks before using them.
That said, Message Center posts can vary between tenants, so the most accurate information for your organization will always come from your own Microsoft 365 Message Center.
For that reason, I would still recommend working with your Global Administrator or your admin team. They may be able to share relevant SharePoint announcements with you on a regular basis.
If you feel your concern has been addressed, I would greatly appreciate it if you could mark the answer as accepted. As other users will also search information in this community, your valuable vote will definitely also help other users who have similar queries easily to find the correct channel and useful information more quickly.
I truly hope this helps make things a little easier for you.