Hi @Sophia
I have looked and made sure that the user who is getting those notifications hasn't enabled "Notify when Available" option.
Have you tried turning on the user's "Notify when Available" option and then turn it off to see if there would be any difference? You can do this through the chat or via the notification settings. See the article below for more details:
Get notified when someone's status changes in Teams
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.