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Dear เกียรติภูมิ ทองสิน,Thanks for visiting Microsoft Community.I understand that you are experiencing an account error with Office and need to sign in repeatedly.Recently we have received many reports from different users with the same issue as yours. Microsoft is aware of this issue.Based on feedback from many users, we've summarized the following options for you to try:1. Modify the registry1. Press Windows+R to open the run box, copy and paste the following path, back up all the folders in this path and then delete them.%localappdata%/Microsoft/OneAuth%localappdata%/Microsoft/IdentityCache2. Press Windows+R, enter regedit, click OK, open the registry, find the following registry subkey, right-click Identity, and delete it.HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\IdentityDisclaimer: Generally, modifying registry subkeys or work group is intended for advanced users, administrators, and IT Professionals. It can help fix some problems, however, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For further protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click here to view the article.2. Download and install Office again.First you follow the steps in this link to uninstall Office.Uninstall Office from a PC - Microsoft Support After uninstalling Office, click on the link below to re-download and install Office again https://officecdn.microsoft.com/sg/492350f6-3a01-4f97-b9c0-c7c6ddf67d60/media/en-us/O365HomePremRetail.img3. Rollback Office version1, close all Office software, in the "Start Menu" in the search "Command Prompt" (or "cmd"), and the right mouse button click and select "Run as administrator";2, in the command prompt enter the following code:cd %programfiles% \Common Files\microsoft shared\ClickToRun Enter;3, and then enterOfficec2rclient.exe /update user updatetoversion=16.0.17531.20120Please feel free to contact me if you need further assistance.Best regards