Keyset does not exist

HI Karen Durda,

Good day to you and I hope you are doing well.

Could you help to submit your vote below the reply so that it is pinned at the top and other community users can easily find this thread? You will have helped many of them in case they have a similar query.

Thanks in advance and have a great day

HI Karen Durda,

Good day to you and I hope you are doing well.

Sorry to disturb you. As we did not get a response, may I know if the above reply could clarify your issue, or could you please help confirm if we may help you with anything else? And if the provided information meets your requirements, you can also vote on that. It helps other users who are searching for this same information and find the information.

Your understanding and patience will be appreciated.

HI Karen Durda,

Good day!

Thank you for posting to the Microsoft Community. We are glad to assist.

Based on your post regarding with "Keyset does not exist Error Code 80090016".it seems that you get issue when activate Office, you get error, as for the issue, here are some suggestions:

1. Try reset Office activation status with tool from link: OLicenseCleanup.vbs, the tool can help solve the issue if it is caused by account conflict.
2. Go to Start Menus>Settings>Account>Access work or school, disconnect all your accounts from here, then restart your PC, sign in Excel again and check the result. You may also try automate this by the tool from the link: Clear credentials from Workplace Join
3. If you get account from your company or school and they require you to set up multifactor authentication for your account,  please sign in https://portal.office.com check if you are required to set up MFA. Check the link for more information: Set up your Microsoft 365 sign-in for multi-factor authentication
4. Try follow the link to clear TPM Key and check the result: Clear all the keys from the TPM
5. Check for Antivirus Interference: Disable any antivirus software temporarily and try activating Office again.
6. Update TPM Drivers: Ensure your TPM drivers are up to date.

We are looking forward to your response! Thanks for your precious time. Have a nice day!