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Hi D Bartkowiak,
I understand how urgent this is, especially since the missing conversations contain information you still need.
Since you have already checked both accounts, confirmed that the chats are unavailable online, reviewed the exported activity history, and submitted feedback, repeating the usual sign-in and browser checks is unlikely to provide anything new. Unfortunately, this user-to-user forum cannot examine account-level migration records or restore missing Copilot conversations.
Please contact Microsoft Support and describe the issue specifically as missing Copilot chat history after the recent update. Let them know that the conversations are absent from both accounts and do not appear in the activity-history export. You can also mention that feedback was submitted without a screenshot because the feedback form opened in a separate window.
When speaking with Support, share the approximate date when the chats disappeared, the sign-in methods used for both accounts, and whether the accounts are personal or work/school accounts. Please provide account information only through the private Support channel, not in this public forum.
If either affected account is a work or school account, please also contact your organization’s Microsoft 365 administrator, as they may need to open a service request for an account-level investigation.
Thank you for your understanding.
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