De klassieke versie van Outlook voor Windows gebruiken voor het beheren van persoonlijk e-mail en agenda en contacten
Sandra,
I've seen this type of issue often on the forum.
Signing out of all sessions typically could work for the cases I've worked on with others, but it requires at least 24 hours, it is not instant. So, if it hasn't been 24 hours yet, please be patient. That is what typically fixed other people's cases.
Another area you want to check is the To-Do list. Make sure you delete all To-Do items that were not created by you.
If you use Classic Outlook on any Windows device, do this on those devices.
Close Outlook completely.
Press Win + R on your keyboard to open the Run dialog.
Type outlook /cleanrules and press Enter to clear and reset client-side rule stores. Consider doing this again after 24 hours.