Account locking on exchange from mobile.

For a user, I am seeing following logs in exchange IIS log files. Which saying error 401 

u_ex23113000_x.log:2023-11-30 08:40:18 10.42.9.23 OPTIONS /Microsoft-Server-ActiveSync/default.eas Cmd=Options&User=contoso%2Famarsing&DeviceId=OPCC27C22ACB6DCE18EFF705FA67CCD5&DeviceType=Outlook&CorrelationID=<empty>;&cafeReqId=aa098ffb-c9cd-4918-b00d-38ecec825042; 443 contoso/xyzuser 10.20.25.25 Outlook-iOS-Android/1.0 - 401 1 1326 15 52.91.54.149
u_ex23113000_x.log:2023-11-30 08:50:25 10.42.9.23 OPTIONS /Microsoft-Server-ActiveSync/default.eas Cmd=Options&User=contoso%2Famarsing&DeviceId=OPCC27C22ACB6DCE18EFF705FA67CCD5&DeviceType=Outlook&CorrelationID=<empty>;&cafeReqId=3cf55103-43e7-49ea-af08-3c596d3311a4; 443 - 10.20.25.25 Outlook-iOS-Android/1.0 - 401 2 5 0 52.98.89.125
u_ex23113001_x.log:2023-11-30 09:00:53 10.42.9.23 OPTIONS /Microsoft-Server-ActiveSync/default.eas Cmd=Options&User=contoso%2Famarsing&DeviceId=OPCC27C22ACB6DCE18EFF705FA67CCD5&DeviceType=Outlook&CorrelationID=<empty>;&cafeReqId=7076901b-846f-4c59-a806-2dd50331121a; 443 contoso/xyzuser 10.20.25.25 Outlook-iOS-Android/1.0 - 401 1 1909 0 40.92.68.117
u_ex23113002_x.log:2023-11-30 10:10:44 10.42.9.23 OPTIONS /Microsoft-Server-ActiveSync/default.eas Cmd=Options&User=contoso%2Famarsing&DeviceId=OPCC27C22ACB6DCE18EFF705FA67CCD5&DeviceType=Outlook&CorrelationID=<empty>;&cafeReqId=55806c16-4b3a-439d-baaa-d36af959a52a; 443 contoso/xyzuser 10.20.25.25 Outlook-iOS-Android/1.0 - 401 1 1326 15 40.92.49.93
u_ex23113002_x.log:2023-11-30 10:28:42 10.42.9.23 OPTIONS /Microsoft-Server-ActiveSync/default.eas Cmd=Options&User=contoso%2Famarsing&DeviceId=OPCC27C22ACB6DCE18EFF705FA67CCD5&DeviceType=Outlook&CorrelationID=<empty>;&cafeReqId=aca52c14-3b70-4f9c-877a-f9a8cf2f2fb6; 443 contoso/xyzuser 10.20.25.25 Outlook-iOS-Android/1.0 - 401 1 1909 0 40.96.101.53
u_ex23113002_x.log:2023-11-30 10:33:29 10.42.9.23 OPTIONS /Microsoft-Server-ActiveSync/default.eas Cmd=Options&User=contoso%2Famarsing&DeviceId=OPCC27C22ACB6DCE18EFF705FA67CCD5&DeviceType=Outlook&CorrelationID=<empty>;&cafeReqId=308d1824-88f4-47f8-907c-1595dc9e6658; 443 contoso/xyzuser 10.20.25.25 Outlook-iOS-Android/1.0 - 401 1 1909 0 40.96.101.53

I asked user to uninstall outlook mobile client just to reproduce issue, however account is still locking and I am seeing same logs still coming. What else I should check. 

User is using Google Pixel 7 pro android.