是多重激活了，把激活码失效的删除即可
1、以管理员权限打开cmd（必须以管理员权限，不然无法删除无效的激活码）
2、输入命令：cd C:Program Files (x86)Microsoft OfficeOffice16
（目录的路径根据实际安装情况输入）
命令说明：切换到C:Program Files (x86)Microsoft OfficeOffice16此目录
面板会显示如下说明切换目录成功：
C:WINDOWSsystem32>cd C:Program Files (x86)Microsoft OfficeOffice16
3、再输入命令：cscript OSPP.VBS /dstatus
命令说明：查看office激活信息
面板会显示如下（隐藏部分用问号代替）【命令提示符中可以进行复制粘贴操作】
Microsoft (R) Windows Script Host Version 5.812
版权所有(C) Microsoft Corporation。保留所有权利。
---Processing--------------------------
---------------------------------------
PRODUCT ID: ？？？？？-？？？？？-？？？？？-？？？？？
SKU ID: ？？？
LICENSE NAME: Office 16, Office16ProPlusR_Grace edition（具体版本）
LICENSE DESCRIPTION: Office 16, RETAIL(Grace) channel （Retail为零售版，VL为批量授权）
BETA EXPIRATION: 1601/1/1
LICENSE STATUS: ---NOTIFICATIONS---
ERROR CODE: 0xC004F009
ERROR DESCRIPTION: The Software Licensing Service reported that the grace period expired.
Last 5 characters of installed product key: BTDRB
---------------------------------------
PRODUCT ID: ??????
SKU ID: ??????
LICENSE NAME: Office 16, Office16ProPlusVL_KMS_Client edition
LICENSE DESCRIPTION: Office 16, VOLUME_KMSCLIENT channel
BETA EXPIRATION: 1601/1/1
LICENSE STATUS: ---OOB_GRACE---
ERROR CODE: 0x4004F00C （这个是打开office左下角出现的错误代码）
ERROR DESCRIPTION: The Software Licensing Service reported that the application is running within the valid grace period.
REMAINING GRACE: 4 days (6686 minute(s) before expiring) （打开office提示剩余天数4天）
Last 5 characters of installed product key: WFG99 （这个是激活码的后五位,重点在这里，记住这个“WFG99”，每个人的不一样，自己看自己的后五位是多少）
Activation Type Configuration: ALL
DNS auto-discovery: KMS name not available
Activation Interval: 120 minutes
Renewal Interval: 10080 minutes
KMS host caching: Enabled
---------------------------------------
PRODUCT ID:？？？
SKU ID: ？？？
LICENSE NAME: Office 16, Office16ProPlusR_Retail edition
LICENSE DESCRIPTION: Office 16, RETAIL channel
BETA EXPIRATION: 1601/1/1
LICENSE STATUS: ---OOB_GRACE---
ERROR CODE: 0x4004F00C
ERROR DESCRIPTION: The Software Licensing Service reported that the application is running within the valid grace period.
REMAINING GRACE: 20 days (28940 minute(s) before expiring)
Last 5 characters of installed product key: 722QV
---------------------------------------
---------------------------------------
---Exiting-----------------------------
4、最后输入此命令删除多余的激活信息：cscript ospp.vbs /unpkey:WFG99（有提示剩余天数那一栏的激活码）
面板会显示如下即删除成功
Microsoft (R) Windows Script Host Version 5.812
版权所有(C) Microsoft Corporation。保留所有权利。
---Processing--------------------------
---------------------------------------
Uninstalling product key for: Office 16, Office16ProPlusVL_KMS_Client edition
<Product key uninstall successful>
---------------------------------------
---Exiting-----------------------------
5、再此打开office，没有提示快过期的窗口了