Using Classic Outlook on Windows for personal email, calendar, and contact management
Hello 0ptix,
We are sorry that issue still persists.
Since you've tried those suggested steps, it is possible that your mailbox may have some issues on back-end side. We have dedicated support team which have more recourse to check with you remotely, so it is also recommended to directly contact them by submitting a support ticket:
- Go to the admin center at https://admin.microsoft.com. If you get a message that says you don't have permission to access this page or perform this action, you aren't an admin. For more information, see Who has admin permissions in my business?.
- On the bottom right side of the page, select Help & support.
- Type a question or keyword into the text box. If you get a drop-down list, select the one closest to your question, or continue typing your question, then press Enter.
- If the results don't help, at the bottom, select Contact Support.
- Enter a description of your issue, confirm your contact number and email address, select your preferred contact method, and then select Contact me. The expected wait time is indicated in the Contact support pane.
Feel free to reply us if you need further assistance. Wish you have a nice day!