Based on your description, issue your system defaults to your work account and I cannot force another to open in Outlook. Since we mainly discuss capabilities and operation of Exchange Online in this forum and your issue is more related to Outlook client
side, to better resolve it, I will move the thread to Outlook IT Pro Discussions forum.
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us.
Regards,
Manu Meng
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