Is this still happening for you? Votes have dropped off so I hope this has resolved. Please let me know!
Please comment in this thread your response.
An error occurred while saving the commentTeemu commented
It has been fixed for a while now
Thank you for your feedback. We’re happy to announce that an option to choose between Windows 10 Native Notifications and Teams Notifications is included in our Dec 2020 Public Preview pack, and will be available to users who opt into Public Preview.
You can learn more about the new Microsoft Teams Public Preview program here: https://aka.ms/TeamsPublicPreview, and Teams administrators can find documentation to manage which users will see the Public Preview option here: https://aka.ms/TeamsPublicPreviewAdmin